type_traits revision 227825
1// -*- C++ -*- 2//===------------------------ type_traits ---------------------------------===// 3// 4// The LLVM Compiler Infrastructure 5// 6// This file is dual licensed under the MIT and the University of Illinois Open 7// Source Licenses. See LICENSE.TXT for details. 8// 9//===----------------------------------------------------------------------===// 10 11#ifndef _LIBCPP_TYPE_TRAITS 12#define _LIBCPP_TYPE_TRAITS 13 14/* 15 type_traits synopsis 16 17namespace std 18{ 19 20 // helper class: 21 template <class T, T v> struct integral_constant; 22 typedef integral_constant<bool, true> true_type; 23 typedef integral_constant<bool, false> false_type; 24 25 // helper traits 26 template <bool, class T = void> struct enable_if; 27 template <bool, class T, class F> struct conditional; 28 29 // Primary classification traits: 30 template <class T> struct is_void; 31 template <class T> struct is_integral; 32 template <class T> struct is_floating_point; 33 template <class T> struct is_array; 34 template <class T> struct is_pointer; 35 template <class T> struct is_lvalue_reference; 36 template <class T> struct is_rvalue_reference; 37 template <class T> struct is_member_object_pointer; 38 template <class T> struct is_member_function_pointer; 39 template <class T> struct is_enum; 40 template <class T> struct is_union; 41 template <class T> struct is_class; 42 template <class T> struct is_function; 43 44 // Secondary classification traits: 45 template <class T> struct is_reference; 46 template <class T> struct is_arithmetic; 47 template <class T> struct is_fundamental; 48 template <class T> struct is_member_pointer; 49 template <class T> struct is_scalar; 50 template <class T> struct is_object; 51 template <class T> struct is_compound; 52 53 // Const-volatile properties and transformations: 54 template <class T> struct is_const; 55 template <class T> struct is_volatile; 56 template <class T> struct remove_const; 57 template <class T> struct remove_volatile; 58 template <class T> struct remove_cv; 59 template <class T> struct add_const; 60 template <class T> struct add_volatile; 61 template <class T> struct add_cv; 62 63 // Reference transformations: 64 template <class T> struct remove_reference; 65 template <class T> struct add_lvalue_reference; 66 template <class T> struct add_rvalue_reference; 67 68 // Pointer transformations: 69 template <class T> struct remove_pointer; 70 template <class T> struct add_pointer; 71 72 // Integral properties: 73 template <class T> struct is_signed; 74 template <class T> struct is_unsigned; 75 template <class T> struct make_signed; 76 template <class T> struct make_unsigned; 77 78 // Array properties and transformations: 79 template <class T> struct rank; 80 template <class T, unsigned I = 0> struct extent; 81 template <class T> struct remove_extent; 82 template <class T> struct remove_all_extents; 83 84 // Member introspection: 85 template <class T> struct is_pod; 86 template <class T> struct is_trivial; 87 template <class T> struct is_trivially_copyable; 88 template <class T> struct is_standard_layout; 89 template <class T> struct is_literal_type; 90 template <class T> struct is_empty; 91 template <class T> struct is_polymorphic; 92 template <class T> struct is_abstract; 93 94 template <class T, class... Args> struct is_constructible; 95 template <class T> struct is_default_constructible; 96 template <class T> struct is_copy_constructible; 97 template <class T> struct is_move_constructible; 98 template <class T, class U> struct is_assignable; 99 template <class T> struct is_copy_assignable; 100 template <class T> struct is_move_assignable; 101 template <class T> struct is_destructible; 102 103 template <class T, class... Args> struct is_trivially_constructible; 104 template <class T> struct is_trivially_default_constructible; 105 template <class T> struct is_trivially_copy_constructible; 106 template <class T> struct is_trivially_move_constructible; 107 template <class T, class U> struct is_trivially_assignable; 108 template <class T> struct is_trivially_copy_assignable; 109 template <class T> struct is_trivially_move_assignable; 110 template <class T> struct is_trivially_destructible; 111 112 template <class T, class... Args> struct is_nothrow_constructible; 113 template <class T> struct is_nothrow_default_constructible; 114 template <class T> struct is_nothrow_copy_constructible; 115 template <class T> struct is_nothrow_move_constructible; 116 template <class T, class U> struct is_nothrow_assignable; 117 template <class T> struct is_nothrow_copy_assignable; 118 template <class T> struct is_nothrow_move_assignable; 119 template <class T> struct is_nothrow_destructible; 120 121 template <class T> struct has_virtual_destructor; 122 123 // Relationships between types: 124 template <class T, class U> struct is_same; 125 template <class Base, class Derived> struct is_base_of; 126 template <class From, class To> struct is_convertible; 127 128 // Alignment properties and transformations: 129 template <class T> struct alignment_of; 130 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 131 struct aligned_storage; 132 133 template <class T> struct decay; 134 template <class... T> struct common_type; 135 template <class T> struct underlying_type; 136 template <class> class result_of; // undefined 137 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; 138 139} // std 140 141*/ 142#include <__config> 143#include <cstddef> 144 145#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 146#pragma GCC system_header 147#endif 148 149_LIBCPP_BEGIN_NAMESPACE_STD 150 151template <bool _B, class _If, class _Then> 152 struct _LIBCPP_VISIBLE conditional {typedef _If type;}; 153template <class _If, class _Then> 154 struct _LIBCPP_VISIBLE conditional<false, _If, _Then> {typedef _Then type;}; 155 156template <bool, class _Tp = void> struct _LIBCPP_VISIBLE enable_if {}; 157template <class _Tp> struct _LIBCPP_VISIBLE enable_if<true, _Tp> {typedef _Tp type;}; 158 159struct __two {char _[2];}; 160 161// helper class: 162 163template <class _Tp, _Tp __v> 164struct _LIBCPP_VISIBLE integral_constant 165{ 166 static constexpr _Tp value = __v; 167 typedef _Tp value_type; 168 typedef integral_constant type; 169 _LIBCPP_INLINE_VISIBILITY 170#ifndef _LIBCPP_HAS_NO_CONSTEXPR 171 constexpr 172#endif 173 operator value_type() 174#ifdef _LIBCPP_HAS_NO_CONSTEXPR 175 const 176#endif 177 {return value;} 178}; 179 180template <class _Tp, _Tp __v> 181constexpr _Tp integral_constant<_Tp, __v>::value; 182 183typedef integral_constant<bool, true> true_type; 184typedef integral_constant<bool, false> false_type; 185 186// is_const 187 188template <class _Tp> struct _LIBCPP_VISIBLE is_const : public false_type {}; 189template <class _Tp> struct _LIBCPP_VISIBLE is_const<_Tp const> : public true_type {}; 190 191// is_volatile 192 193template <class _Tp> struct _LIBCPP_VISIBLE is_volatile : public false_type {}; 194template <class _Tp> struct _LIBCPP_VISIBLE is_volatile<_Tp volatile> : public true_type {}; 195 196// remove_const 197 198template <class _Tp> struct _LIBCPP_VISIBLE remove_const {typedef _Tp type;}; 199template <class _Tp> struct _LIBCPP_VISIBLE remove_const<const _Tp> {typedef _Tp type;}; 200 201// remove_volatile 202 203template <class _Tp> struct _LIBCPP_VISIBLE remove_volatile {typedef _Tp type;}; 204template <class _Tp> struct _LIBCPP_VISIBLE remove_volatile<volatile _Tp> {typedef _Tp type;}; 205 206// remove_cv 207 208template <class _Tp> struct _LIBCPP_VISIBLE remove_cv 209{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 210 211// is_void 212 213template <class _Tp> struct __is_void : public false_type {}; 214template <> struct __is_void<void> : public true_type {}; 215 216template <class _Tp> struct _LIBCPP_VISIBLE is_void 217 : public __is_void<typename remove_cv<_Tp>::type> {}; 218 219// __is_nullptr_t 220 221template <class _Tp> struct ____is_nullptr_t : public false_type {}; 222template <> struct ____is_nullptr_t<nullptr_t> : public true_type {}; 223 224template <class _Tp> struct _LIBCPP_VISIBLE __is_nullptr_t 225 : public ____is_nullptr_t<typename remove_cv<_Tp>::type> {}; 226 227// is_integral 228 229template <class _Tp> struct __is_integral : public false_type {}; 230template <> struct __is_integral<bool> : public true_type {}; 231template <> struct __is_integral<char> : public true_type {}; 232template <> struct __is_integral<signed char> : public true_type {}; 233template <> struct __is_integral<unsigned char> : public true_type {}; 234template <> struct __is_integral<wchar_t> : public true_type {}; 235#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 236template <> struct __is_integral<char16_t> : public true_type {}; 237template <> struct __is_integral<char32_t> : public true_type {}; 238#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 239template <> struct __is_integral<short> : public true_type {}; 240template <> struct __is_integral<unsigned short> : public true_type {}; 241template <> struct __is_integral<int> : public true_type {}; 242template <> struct __is_integral<unsigned int> : public true_type {}; 243template <> struct __is_integral<long> : public true_type {}; 244template <> struct __is_integral<unsigned long> : public true_type {}; 245template <> struct __is_integral<long long> : public true_type {}; 246template <> struct __is_integral<unsigned long long> : public true_type {}; 247 248template <class _Tp> struct _LIBCPP_VISIBLE is_integral 249 : public __is_integral<typename remove_cv<_Tp>::type> {}; 250 251// is_floating_point 252 253template <class _Tp> struct __is_floating_point : public false_type {}; 254template <> struct __is_floating_point<float> : public true_type {}; 255template <> struct __is_floating_point<double> : public true_type {}; 256template <> struct __is_floating_point<long double> : public true_type {}; 257 258template <class _Tp> struct _LIBCPP_VISIBLE is_floating_point 259 : public __is_floating_point<typename remove_cv<_Tp>::type> {}; 260 261// is_array 262 263template <class _Tp> struct _LIBCPP_VISIBLE is_array 264 : public false_type {}; 265template <class _Tp> struct _LIBCPP_VISIBLE is_array<_Tp[]> 266 : public true_type {}; 267template <class _Tp, size_t _Np> struct _LIBCPP_VISIBLE is_array<_Tp[_Np]> 268 : public true_type {}; 269 270// is_pointer 271 272template <class _Tp> struct __is_pointer : public false_type {}; 273template <class _Tp> struct __is_pointer<_Tp*> : public true_type {}; 274 275template <class _Tp> struct _LIBCPP_VISIBLE is_pointer 276 : public __is_pointer<typename remove_cv<_Tp>::type> {}; 277 278// is_reference 279 280template <class _Tp> struct _LIBCPP_VISIBLE is_lvalue_reference : public false_type {}; 281template <class _Tp> struct _LIBCPP_VISIBLE is_lvalue_reference<_Tp&> : public true_type {}; 282 283template <class _Tp> struct _LIBCPP_VISIBLE is_rvalue_reference : public false_type {}; 284#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 285template <class _Tp> struct _LIBCPP_VISIBLE is_rvalue_reference<_Tp&&> : public true_type {}; 286#endif 287 288template <class _Tp> struct _LIBCPP_VISIBLE is_reference : public false_type {}; 289template <class _Tp> struct _LIBCPP_VISIBLE is_reference<_Tp&> : public true_type {}; 290#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 291template <class _Tp> struct _LIBCPP_VISIBLE is_reference<_Tp&&> : public true_type {}; 292#endif 293 294#if defined(__clang__) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 295#define _LIBCPP_HAS_TYPE_TRAITS 296#endif 297 298// is_union 299 300#if __has_feature(is_union) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 301 302template <class _Tp> struct _LIBCPP_VISIBLE is_union 303 : public integral_constant<bool, __is_union(_Tp)> {}; 304 305#else 306 307template <class _Tp> struct __libcpp_union : public false_type {}; 308template <class _Tp> struct _LIBCPP_VISIBLE is_union 309 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 310 311#endif 312 313// is_class 314 315#if __has_feature(is_class) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 316 317template <class _Tp> struct _LIBCPP_VISIBLE is_class 318 : public integral_constant<bool, __is_class(_Tp)> {}; 319 320#else 321 322namespace __is_class_imp 323{ 324template <class _Tp> char __test(int _Tp::*); 325template <class _Tp> __two __test(...); 326} 327 328template <class _Tp> struct _LIBCPP_VISIBLE is_class 329 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 330 331#endif 332 333// is_same 334 335template <class _Tp, class _Up> struct _LIBCPP_VISIBLE is_same : public false_type {}; 336template <class _Tp> struct _LIBCPP_VISIBLE is_same<_Tp, _Tp> : public true_type {}; 337 338// is_function 339 340namespace __is_function_imp 341{ 342template <class _Tp> char __test(_Tp*); 343template <class _Tp> __two __test(...); 344template <class _Tp> _Tp& __source(); 345} 346 347template <class _Tp, bool = is_class<_Tp>::value || 348 is_union<_Tp>::value || 349 is_void<_Tp>::value || 350 is_reference<_Tp>::value || 351 is_same<_Tp, nullptr_t>::value > 352struct __is_function 353 : public integral_constant<bool, sizeof(__is_function_imp::__test<_Tp>(__is_function_imp::__source<_Tp>())) == 1> 354 {}; 355template <class _Tp> struct __is_function<_Tp, true> : public false_type {}; 356 357template <class _Tp> struct _LIBCPP_VISIBLE is_function 358 : public __is_function<_Tp> {}; 359 360// is_member_function_pointer 361 362template <class _Tp> struct __is_member_function_pointer : public false_type {}; 363template <class _Tp, class _Up> struct __is_member_function_pointer<_Tp _Up::*> : public is_function<_Tp> {}; 364 365template <class _Tp> struct _LIBCPP_VISIBLE is_member_function_pointer 366 : public __is_member_function_pointer<typename remove_cv<_Tp>::type> {}; 367 368// is_member_pointer 369 370template <class _Tp> struct __is_member_pointer : public false_type {}; 371template <class _Tp, class _Up> struct __is_member_pointer<_Tp _Up::*> : public true_type {}; 372 373template <class _Tp> struct _LIBCPP_VISIBLE is_member_pointer 374 : public __is_member_pointer<typename remove_cv<_Tp>::type> {}; 375 376// is_member_object_pointer 377 378template <class _Tp> struct _LIBCPP_VISIBLE is_member_object_pointer 379 : public integral_constant<bool, is_member_pointer<_Tp>::value && 380 !is_member_function_pointer<_Tp>::value> {}; 381 382// is_enum 383 384#if __has_feature(is_enum) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 385 386template <class _Tp> struct _LIBCPP_VISIBLE is_enum 387 : public integral_constant<bool, __is_enum(_Tp)> {}; 388 389#else 390 391template <class _Tp> struct _LIBCPP_VISIBLE is_enum 392 : public integral_constant<bool, !is_void<_Tp>::value && 393 !is_integral<_Tp>::value && 394 !is_floating_point<_Tp>::value && 395 !is_array<_Tp>::value && 396 !is_pointer<_Tp>::value && 397 !is_reference<_Tp>::value && 398 !is_member_pointer<_Tp>::value && 399 !is_union<_Tp>::value && 400 !is_class<_Tp>::value && 401 !is_function<_Tp>::value > {}; 402 403#endif 404 405// is_arithmetic 406 407template <class _Tp> struct _LIBCPP_VISIBLE is_arithmetic 408 : public integral_constant<bool, is_integral<_Tp>::value || 409 is_floating_point<_Tp>::value> {}; 410 411// is_fundamental 412 413template <class _Tp> struct _LIBCPP_VISIBLE is_fundamental 414 : public integral_constant<bool, is_void<_Tp>::value || 415 __is_nullptr_t<_Tp>::value || 416 is_arithmetic<_Tp>::value> {}; 417 418// is_scalar 419 420template <class _Tp> struct _LIBCPP_VISIBLE is_scalar 421 : public integral_constant<bool, is_arithmetic<_Tp>::value || 422 is_member_pointer<_Tp>::value || 423 is_pointer<_Tp>::value || 424 __is_nullptr_t<_Tp>::value || 425 is_enum<_Tp>::value > {}; 426 427template <> struct _LIBCPP_VISIBLE is_scalar<nullptr_t> : public true_type {}; 428 429// is_object 430 431template <class _Tp> struct _LIBCPP_VISIBLE is_object 432 : public integral_constant<bool, is_scalar<_Tp>::value || 433 is_array<_Tp>::value || 434 is_union<_Tp>::value || 435 is_class<_Tp>::value > {}; 436 437// is_compound 438 439template <class _Tp> struct _LIBCPP_VISIBLE is_compound 440 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 441 442// add_const 443 444template <class _Tp, bool = is_reference<_Tp>::value || 445 is_function<_Tp>::value || 446 is_const<_Tp>::value > 447struct __add_const {typedef _Tp type;}; 448 449template <class _Tp> 450struct __add_const<_Tp, false> {typedef const _Tp type;}; 451 452template <class _Tp> struct _LIBCPP_VISIBLE add_const 453 {typedef typename __add_const<_Tp>::type type;}; 454 455// add_volatile 456 457template <class _Tp, bool = is_reference<_Tp>::value || 458 is_function<_Tp>::value || 459 is_volatile<_Tp>::value > 460struct __add_volatile {typedef _Tp type;}; 461 462template <class _Tp> 463struct __add_volatile<_Tp, false> {typedef volatile _Tp type;}; 464 465template <class _Tp> struct _LIBCPP_VISIBLE add_volatile 466 {typedef typename __add_volatile<_Tp>::type type;}; 467 468// add_cv 469 470template <class _Tp> struct _LIBCPP_VISIBLE add_cv 471 {typedef typename add_const<typename add_volatile<_Tp>::type>::type type;}; 472 473// remove_reference 474 475template <class _Tp> struct _LIBCPP_VISIBLE remove_reference {typedef _Tp type;}; 476template <class _Tp> struct _LIBCPP_VISIBLE remove_reference<_Tp&> {typedef _Tp type;}; 477#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 478template <class _Tp> struct _LIBCPP_VISIBLE remove_reference<_Tp&&> {typedef _Tp type;}; 479#endif 480 481// add_lvalue_reference 482 483template <class _Tp> struct _LIBCPP_VISIBLE add_lvalue_reference {typedef _Tp& type;}; 484template <class _Tp> struct _LIBCPP_VISIBLE add_lvalue_reference<_Tp&> {typedef _Tp& type;}; // for older compiler 485template <> struct _LIBCPP_VISIBLE add_lvalue_reference<void> {typedef void type;}; 486template <> struct _LIBCPP_VISIBLE add_lvalue_reference<const void> {typedef const void type;}; 487template <> struct _LIBCPP_VISIBLE add_lvalue_reference<volatile void> {typedef volatile void type;}; 488template <> struct _LIBCPP_VISIBLE add_lvalue_reference<const volatile void> {typedef const volatile void type;}; 489 490#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 491 492template <class _Tp> struct _LIBCPP_VISIBLE add_rvalue_reference {typedef _Tp&& type;}; 493template <> struct _LIBCPP_VISIBLE add_rvalue_reference<void> {typedef void type;}; 494template <> struct _LIBCPP_VISIBLE add_rvalue_reference<const void> {typedef const void type;}; 495template <> struct _LIBCPP_VISIBLE add_rvalue_reference<volatile void> {typedef volatile void type;}; 496template <> struct _LIBCPP_VISIBLE add_rvalue_reference<const volatile void> {typedef const volatile void type;}; 497 498#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 499 500#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 501 502template <class _Tp> 503typename add_rvalue_reference<_Tp>::type 504declval() _NOEXCEPT; 505 506#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 507 508template <class _Tp> 509typename add_lvalue_reference<_Tp>::type 510declval(); 511 512#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 513 514struct __any 515{ 516 __any(...); 517}; 518 519// remove_pointer 520 521template <class _Tp> struct _LIBCPP_VISIBLE remove_pointer {typedef _Tp type;}; 522template <class _Tp> struct _LIBCPP_VISIBLE remove_pointer<_Tp*> {typedef _Tp type;}; 523template <class _Tp> struct _LIBCPP_VISIBLE remove_pointer<_Tp* const> {typedef _Tp type;}; 524template <class _Tp> struct _LIBCPP_VISIBLE remove_pointer<_Tp* volatile> {typedef _Tp type;}; 525template <class _Tp> struct _LIBCPP_VISIBLE remove_pointer<_Tp* const volatile> {typedef _Tp type;}; 526 527// add_pointer 528 529template <class _Tp> struct _LIBCPP_VISIBLE add_pointer 530 {typedef typename remove_reference<_Tp>::type* type;}; 531 532// is_signed 533 534template <class _Tp, bool = is_integral<_Tp>::value> 535struct ___is_signed : public integral_constant<bool, _Tp(-1) < _Tp(0)> {}; 536 537template <class _Tp> 538struct ___is_signed<_Tp, false> : public true_type {}; // floating point 539 540template <class _Tp, bool = is_arithmetic<_Tp>::value> 541struct __is_signed : public ___is_signed<_Tp> {}; 542 543template <class _Tp> struct __is_signed<_Tp, false> : public false_type {}; 544 545template <class _Tp> struct _LIBCPP_VISIBLE is_signed : public __is_signed<_Tp> {}; 546 547// is_unsigned 548 549template <class _Tp, bool = is_integral<_Tp>::value> 550struct ___is_unsigned : public integral_constant<bool, _Tp(0) < _Tp(-1)> {}; 551 552template <class _Tp> 553struct ___is_unsigned<_Tp, false> : public false_type {}; // floating point 554 555template <class _Tp, bool = is_arithmetic<_Tp>::value> 556struct __is_unsigned : public ___is_unsigned<_Tp> {}; 557 558template <class _Tp> struct __is_unsigned<_Tp, false> : public false_type {}; 559 560template <class _Tp> struct _LIBCPP_VISIBLE is_unsigned : public __is_unsigned<_Tp> {}; 561 562// rank 563 564template <class _Tp> struct _LIBCPP_VISIBLE rank 565 : public integral_constant<size_t, 0> {}; 566template <class _Tp> struct _LIBCPP_VISIBLE rank<_Tp[]> 567 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 568template <class _Tp, size_t _Np> struct _LIBCPP_VISIBLE rank<_Tp[_Np]> 569 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 570 571// extent 572 573template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_VISIBLE extent 574 : public integral_constant<size_t, 0> {}; 575template <class _Tp> struct _LIBCPP_VISIBLE extent<_Tp[], 0> 576 : public integral_constant<size_t, 0> {}; 577template <class _Tp, unsigned _Ip> struct _LIBCPP_VISIBLE extent<_Tp[], _Ip> 578 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 579template <class _Tp, size_t _Np> struct _LIBCPP_VISIBLE extent<_Tp[_Np], 0> 580 : public integral_constant<size_t, _Np> {}; 581template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_VISIBLE extent<_Tp[_Np], _Ip> 582 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 583 584// remove_extent 585 586template <class _Tp> struct _LIBCPP_VISIBLE remove_extent 587 {typedef _Tp type;}; 588template <class _Tp> struct _LIBCPP_VISIBLE remove_extent<_Tp[]> 589 {typedef _Tp type;}; 590template <class _Tp, size_t _Np> struct _LIBCPP_VISIBLE remove_extent<_Tp[_Np]> 591 {typedef _Tp type;}; 592 593// remove_all_extents 594 595template <class _Tp> struct _LIBCPP_VISIBLE remove_all_extents 596 {typedef _Tp type;}; 597template <class _Tp> struct _LIBCPP_VISIBLE remove_all_extents<_Tp[]> 598 {typedef typename remove_all_extents<_Tp>::type type;}; 599template <class _Tp, size_t _Np> struct _LIBCPP_VISIBLE remove_all_extents<_Tp[_Np]> 600 {typedef typename remove_all_extents<_Tp>::type type;}; 601 602// is_abstract 603 604namespace __is_abstract_imp 605{ 606template <class _Tp> char __test(_Tp (*)[1]); 607template <class _Tp> __two __test(...); 608} 609 610template <class _Tp, bool = is_class<_Tp>::value> 611struct __libcpp_abstract : public integral_constant<bool, sizeof(__is_abstract_imp::__test<_Tp>(0)) != 1> {}; 612 613template <class _Tp> struct __libcpp_abstract<_Tp, false> : public false_type {}; 614 615template <class _Tp> struct _LIBCPP_VISIBLE is_abstract : public __libcpp_abstract<_Tp> {}; 616 617// is_convertible 618 619#if __has_feature(is_convertible_to) 620 621template <class _T1, class _T2> struct _LIBCPP_VISIBLE is_convertible 622 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 623 624#else // __has_feature(is_convertible_to) 625 626namespace __is_convertible_imp 627{ 628#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 629template <class _Tp> char __test(const volatile typename remove_reference<_Tp>::type&&); 630#else 631template <class _Tp> char __test(_Tp); 632#endif 633template <class _Tp> __two __test(...); 634#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 635template <class _Tp> _Tp&& __source(); 636#else 637template <class _Tp> typename remove_reference<_Tp>::type& __source(); 638#endif 639 640template <class _Tp, bool _IsArray = is_array<_Tp>::value, 641 bool _IsFunction = is_function<_Tp>::value, 642 bool _IsVoid = is_void<_Tp>::value> 643 struct __is_array_function_or_void {enum {value = 0};}; 644template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 645template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 646template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 647} 648 649template <class _Tp, 650 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 651struct __is_convertible_check 652{ 653 static const size_t __v = 0; 654}; 655 656template <class _Tp> 657struct __is_convertible_check<_Tp, 0> 658{ 659 static const size_t __v = sizeof(_Tp); 660}; 661 662template <class _T1, class _T2, 663 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 664 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 665struct __is_convertible 666 : public integral_constant<bool, 667 sizeof(__is_convertible_imp::__test<_T2>(__is_convertible_imp::__source<_T1>())) == 1 668 > 669{}; 670 671template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 0> : false_type {}; 672 673template <class _T1> struct __is_convertible<_T1, const _T1&, 1, 0> : true_type {}; 674#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 675template <class _T1> struct __is_convertible<_T1, _T1&&, 1, 0> : true_type {}; 676template <class _T1> struct __is_convertible<_T1, const _T1&&, 1, 0> : true_type {}; 677template <class _T1> struct __is_convertible<_T1, volatile _T1&&, 1, 0> : true_type {}; 678template <class _T1> struct __is_convertible<_T1, const volatile _T1&&, 1, 0> : true_type {}; 679#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 680 681template <class _T1, class _T2> struct __is_convertible<_T1, _T2*, 1, 0> 682 : public integral_constant<bool, __is_convertible<typename remove_all_extents<_T1>::type*, _T2*>::value> {}; 683 684template <class _T1, class _T2> struct __is_convertible<_T1, _T2* const, 1, 0> 685 : public integral_constant<bool, __is_convertible<typename remove_all_extents<_T1>::type*, _T2*const>::value> {}; 686 687template <class _T1, class _T2> struct __is_convertible<_T1, _T2* volatile, 1, 0> 688 : public integral_constant<bool, __is_convertible<typename remove_all_extents<_T1>::type*, _T2*volatile>::value> {}; 689 690template <class _T1, class _T2> struct __is_convertible<_T1, _T2* const volatile, 1, 0> 691 : public integral_constant<bool, __is_convertible<typename remove_all_extents<_T1>::type*, _T2*const volatile>::value> {}; 692 693template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 0> : public false_type {}; 694#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 695template <class _T1> struct __is_convertible<_T1, _T1&&, 2, 0> : public true_type {}; 696#endif 697template <class _T1> struct __is_convertible<_T1, _T1*, 2, 0> : public true_type {}; 698template <class _T1> struct __is_convertible<_T1, _T1*const, 2, 0> : public true_type {}; 699template <class _T1> struct __is_convertible<_T1, _T1*volatile, 2, 0> : public true_type {}; 700template <class _T1> struct __is_convertible<_T1, _T1*const volatile, 2, 0> : public true_type {}; 701 702template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 0> : public false_type {}; 703 704template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 705template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 706template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 707template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 708 709template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 710template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 711template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 712template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 713 714template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 715template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 716template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 717template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 718 719template <class _T1, class _T2> struct _LIBCPP_VISIBLE is_convertible 720 : public __is_convertible<_T1, _T2> 721{ 722 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 723 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 724}; 725 726#endif // __has_feature(is_convertible_to) 727 728// is_base_of 729 730#ifdef _LIBCP_HAS_IS_BASE_OF 731 732template <class _Bp, class _Dp> 733struct _LIBCPP_VISIBLE is_base_of 734 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 735 736#else // __has_feature(is_base_of) 737 738#error is_base_of not implemented. 739 740#endif // __has_feature(is_base_of) 741 742// is_empty 743 744template <class _Tp> 745struct __is_empty1 746 : public _Tp 747{ 748 double _; 749}; 750 751struct __is_empty2 752{ 753 double _; 754}; 755 756template <class _Tp, bool = is_class<_Tp>::value> 757struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 758 759template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 760 761template <class _Tp> struct _LIBCPP_VISIBLE is_empty : public __libcpp_empty<_Tp> {}; 762 763// is_polymorphic 764 765template <class _Tp> struct __is_polymorphic1 : public _Tp {}; 766template <class _Tp> struct __is_polymorphic2 : public _Tp {virtual ~__is_polymorphic2() throw();}; 767 768template <class _Tp, bool = is_class<_Tp>::value> 769struct __libcpp_polymorphic 770 : public integral_constant<bool, sizeof(__is_polymorphic1<_Tp>) == sizeof(__is_polymorphic2<_Tp>)> {}; 771 772template <class _Tp> struct __libcpp_polymorphic<_Tp, false> : public false_type {}; 773 774template <class _Tp> struct _LIBCPP_VISIBLE is_polymorphic 775 : public __libcpp_polymorphic<_Tp> {}; 776 777// has_virtual_destructor 778 779#if __has_feature(has_virtual_destructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 780 781template <class _Tp> struct _LIBCPP_VISIBLE has_virtual_destructor 782 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 783 784#else // _LIBCPP_HAS_TYPE_TRAITS 785 786template <class _Tp> struct _LIBCPP_VISIBLE has_virtual_destructor 787 : public false_type {}; 788 789#endif // _LIBCPP_HAS_TYPE_TRAITS 790 791// alignment_of 792 793template <class _Tp> struct __alignment_of {_Tp _;}; 794 795template <class _Tp> struct _LIBCPP_VISIBLE alignment_of 796 : public integral_constant<size_t, __alignof__(__alignment_of<typename remove_all_extents<_Tp>::type>)> {}; 797 798// aligned_storage 799 800template <class _Hp, class _Tp> 801struct __type_list 802{ 803 typedef _Hp _Head; 804 typedef _Tp _Tail; 805}; 806 807struct __nat 808{ 809#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS 810 __nat() = delete; 811 __nat(const __nat&) = delete; 812 __nat& operator=(const __nat&) = delete; 813 ~__nat() = delete; 814#endif 815}; 816 817template <class _Tp> 818struct __align_type 819{ 820 static const size_t value = alignment_of<_Tp>::value; 821 typedef _Tp type; 822}; 823 824struct __struct_double {long double _;}; 825struct __struct_double4 {double _[4];}; 826 827typedef 828 __type_list<__align_type<unsigned char>, 829 __type_list<__align_type<unsigned short>, 830 __type_list<__align_type<unsigned int>, 831 __type_list<__align_type<unsigned long>, 832 __type_list<__align_type<unsigned long long>, 833 __type_list<__align_type<double>, 834 __type_list<__align_type<long double>, 835 __type_list<__align_type<__struct_double>, 836 __type_list<__align_type<__struct_double4>, 837 __type_list<__align_type<int*>, 838 __nat 839 > > > > > > > > > > __all_types; 840 841template <class _TL, size_t _Align> struct __find_pod; 842 843template <class _Hp, size_t _Align> 844struct __find_pod<__type_list<_Hp, __nat>, _Align> 845{ 846 typedef typename conditional< 847 _Align == _Hp::value, 848 typename _Hp::type, 849 void 850 >::type type; 851}; 852 853template <class _Hp, class _Tp, size_t _Align> 854struct __find_pod<__type_list<_Hp, _Tp>, _Align> 855{ 856 typedef typename conditional< 857 _Align == _Hp::value, 858 typename _Hp::type, 859 typename __find_pod<_Tp, _Align>::type 860 >::type type; 861}; 862 863template <class _TL, size_t _Len> struct __find_max_align; 864 865template <class _Hp, size_t _Len> 866struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 867 868template <size_t _Len, size_t _A1, size_t _A2> 869struct __select_align 870{ 871private: 872 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 873 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 874public: 875 static const size_t value = _Len < __max ? __min : __max; 876}; 877 878template <class _Hp, class _Tp, size_t _Len> 879struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 880 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 881 882template <size_t _Len, const size_t _Align = __find_max_align<__all_types, _Len>::value> 883struct _LIBCPP_VISIBLE aligned_storage 884{ 885 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 886 static_assert(!is_void<_Aligner>::value, ""); 887 union type 888 { 889 _Aligner __align; 890 unsigned char __data[_Len]; 891 }; 892}; 893 894#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 895template <size_t _Len>\ 896struct _LIBCPP_VISIBLE aligned_storage<_Len, n>\ 897{\ 898 struct _ALIGNAS(n) type\ 899 {\ 900 unsigned char _[_Len];\ 901 };\ 902} 903 904_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 905_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 906_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 907_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 908_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 909_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 910_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 911_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 912_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 913_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 914_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 915_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 916_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 917_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 918// MSDN says that MSVC does not support alignment beyond 8192 (=0x2000) 919#if !defined(_MSC_VER) 920_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 921#endif // !_MSC_VER 922 923#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 924 925// __promote 926 927template <class _A1, class _A2 = void, class _A3 = void, 928 bool = (is_arithmetic<_A1>::value || is_void<_A1>::value) && 929 (is_arithmetic<_A2>::value || is_void<_A2>::value) && 930 (is_arithmetic<_A3>::value || is_void<_A3>::value)> 931class __promote {}; 932 933template <class _A1, class _A2, class _A3> 934class __promote<_A1, _A2, _A3, true> 935{ 936private: 937 typedef typename __promote<_A1>::type __type1; 938 typedef typename __promote<_A2>::type __type2; 939 typedef typename __promote<_A3>::type __type3; 940public: 941 typedef decltype(__type1() + __type2() + __type3()) type; 942}; 943 944template <class _A1, class _A2> 945class __promote<_A1, _A2, void, true> 946{ 947private: 948 typedef typename __promote<_A1>::type __type1; 949 typedef typename __promote<_A2>::type __type2; 950public: 951 typedef decltype(__type1() + __type2()) type; 952}; 953 954template <class _A1> 955class __promote<_A1, void, void, true> 956{ 957public: 958 typedef typename conditional<is_arithmetic<_A1>::value, 959 typename conditional<is_integral<_A1>::value, double, _A1>::type, 960 void 961 >::type type; 962}; 963 964#ifdef _LIBCPP_STORE_AS_OPTIMIZATION 965 966// __transform 967 968template <class _Tp, size_t = sizeof(_Tp), bool = is_scalar<_Tp>::value> struct __transform {typedef _Tp type;}; 969template <class _Tp> struct __transform<_Tp, 1, true> {typedef unsigned char type;}; 970template <class _Tp> struct __transform<_Tp, 2, true> {typedef unsigned short type;}; 971template <class _Tp> struct __transform<_Tp, 4, true> {typedef unsigned int type;}; 972template <class _Tp> struct __transform<_Tp, 8, true> {typedef unsigned long long type;}; 973 974#endif // _LIBCPP_STORE_AS_OPTIMIZATION 975 976// make_signed / make_unsigned 977 978typedef 979 __type_list<signed char, 980 __type_list<signed short, 981 __type_list<signed int, 982 __type_list<signed long, 983 __type_list<signed long long, 984 __nat 985 > > > > > __signed_types; 986 987typedef 988 __type_list<unsigned char, 989 __type_list<unsigned short, 990 __type_list<unsigned int, 991 __type_list<unsigned long, 992 __type_list<unsigned long long, 993 __nat 994 > > > > > __unsigned_types; 995 996template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 997 998template <class _Hp, class _Tp, size_t _Size> 999struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 1000{ 1001 typedef _Hp type; 1002}; 1003 1004template <class _Hp, class _Tp, size_t _Size> 1005struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 1006{ 1007 typedef typename __find_first<_Tp, _Size>::type type; 1008}; 1009 1010template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 1011 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 1012struct __apply_cv 1013{ 1014 typedef _Up type; 1015}; 1016 1017template <class _Tp, class _Up> 1018struct __apply_cv<_Tp, _Up, true, false> 1019{ 1020 typedef const _Up type; 1021}; 1022 1023template <class _Tp, class _Up> 1024struct __apply_cv<_Tp, _Up, false, true> 1025{ 1026 typedef volatile _Up type; 1027}; 1028 1029template <class _Tp, class _Up> 1030struct __apply_cv<_Tp, _Up, true, true> 1031{ 1032 typedef const volatile _Up type; 1033}; 1034 1035template <class _Tp, class _Up> 1036struct __apply_cv<_Tp&, _Up, false, false> 1037{ 1038 typedef _Up& type; 1039}; 1040 1041template <class _Tp, class _Up> 1042struct __apply_cv<_Tp&, _Up, true, false> 1043{ 1044 typedef const _Up& type; 1045}; 1046 1047template <class _Tp, class _Up> 1048struct __apply_cv<_Tp&, _Up, false, true> 1049{ 1050 typedef volatile _Up& type; 1051}; 1052 1053template <class _Tp, class _Up> 1054struct __apply_cv<_Tp&, _Up, true, true> 1055{ 1056 typedef const volatile _Up& type; 1057}; 1058 1059template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1060struct __make_signed {}; 1061 1062template <class _Tp> 1063struct __make_signed<_Tp, true> 1064{ 1065 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 1066}; 1067 1068template <> struct __make_signed<bool, true> {}; 1069template <> struct __make_signed< signed short, true> {typedef short type;}; 1070template <> struct __make_signed<unsigned short, true> {typedef short type;}; 1071template <> struct __make_signed< signed int, true> {typedef int type;}; 1072template <> struct __make_signed<unsigned int, true> {typedef int type;}; 1073template <> struct __make_signed< signed long, true> {typedef long type;}; 1074template <> struct __make_signed<unsigned long, true> {typedef long type;}; 1075template <> struct __make_signed< signed long long, true> {typedef long long type;}; 1076template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 1077 1078template <class _Tp> 1079struct _LIBCPP_VISIBLE make_signed 1080{ 1081 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 1082}; 1083 1084template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1085struct __make_unsigned {}; 1086 1087template <class _Tp> 1088struct __make_unsigned<_Tp, true> 1089{ 1090 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 1091}; 1092 1093template <> struct __make_unsigned<bool, true> {}; 1094template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 1095template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 1096template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 1097template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 1098template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 1099template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 1100template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 1101template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 1102 1103template <class _Tp> 1104struct _LIBCPP_VISIBLE make_unsigned 1105{ 1106 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 1107}; 1108 1109#ifdef _LIBCPP_HAS_NO_VARIADICS 1110 1111template <class _Tp, class _Up = void, class V = void> 1112struct _LIBCPP_VISIBLE common_type 1113{ 1114public: 1115 typedef typename common_type<typename common_type<_Tp, _Up>::type, V>::type type; 1116}; 1117 1118template <class _Tp> 1119struct _LIBCPP_VISIBLE common_type<_Tp, void, void> 1120{ 1121public: 1122 typedef _Tp type; 1123}; 1124 1125template <class _Tp, class _Up> 1126struct _LIBCPP_VISIBLE common_type<_Tp, _Up, void> 1127{ 1128private: 1129#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1130 static _Tp&& __t(); 1131 static _Up&& __u(); 1132#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 1133 static _Tp __t(); 1134 static _Up __u(); 1135#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 1136public: 1137 typedef decltype(true ? __t() : __u()) type; 1138}; 1139 1140#else // _LIBCPP_HAS_NO_VARIADICS 1141 1142template <class ..._Tp> struct common_type; 1143 1144template <class _Tp> 1145struct _LIBCPP_VISIBLE common_type<_Tp> 1146{ 1147 typedef _Tp type; 1148}; 1149 1150template <class _Tp, class _Up> 1151struct _LIBCPP_VISIBLE common_type<_Tp, _Up> 1152{ 1153private: 1154 static _Tp&& __t(); 1155 static _Up&& __u(); 1156 static bool __f(); 1157public: 1158 typedef decltype(__f() ? __t() : __u()) type; 1159}; 1160 1161template <class _Tp, class _Up, class ..._Vp> 1162struct _LIBCPP_VISIBLE common_type<_Tp, _Up, _Vp...> 1163{ 1164 typedef typename common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type; 1165}; 1166 1167#endif // _LIBCPP_HAS_NO_VARIADICS 1168 1169// is_assignable 1170 1171template <class _Tp, class _Arg> 1172decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>(), true_type())) 1173#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1174__is_assignable_test(_Tp&&, _Arg&&); 1175#else 1176__is_assignable_test(_Tp, _Arg&); 1177#endif 1178 1179template <class _Arg> 1180false_type 1181#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1182__is_assignable_test(__any, _Arg&&); 1183#else 1184__is_assignable_test(__any, _Arg&); 1185#endif 1186 1187template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 1188struct __is_assignable_imp 1189 : public common_type 1190 < 1191 decltype(__is_assignable_test(declval<_Tp>(), declval<_Arg>())) 1192 >::type {}; 1193 1194template <class _Tp, class _Arg> 1195struct __is_assignable_imp<_Tp, _Arg, true> 1196 : public false_type 1197{ 1198}; 1199 1200template <class _Tp, class _Arg> 1201struct is_assignable 1202 : public __is_assignable_imp<_Tp, _Arg> {}; 1203 1204// is_copy_assignable 1205 1206template <class _Tp> struct _LIBCPP_VISIBLE is_copy_assignable 1207 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 1208 const typename add_lvalue_reference<_Tp>::type> {}; 1209 1210// is_move_assignable 1211 1212template <class _Tp> struct _LIBCPP_VISIBLE is_move_assignable 1213#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1214 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 1215 const typename add_rvalue_reference<_Tp>::type> {}; 1216#else 1217 : public is_copy_assignable<_Tp> {}; 1218#endif 1219 1220// is_destructible 1221 1222template <class _Tp> 1223struct __destructible_test 1224{ 1225 _Tp __t; 1226}; 1227 1228template <class _Tp> 1229decltype((_VSTD::declval<__destructible_test<_Tp> >().~__destructible_test<_Tp>(), true_type())) 1230#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1231__is_destructible_test(_Tp&&); 1232#else 1233__is_destructible_test(_Tp&); 1234#endif 1235 1236false_type 1237__is_destructible_test(__any); 1238 1239template <class _Tp, bool = is_void<_Tp>::value || is_abstract<_Tp>::value> 1240struct __destructible_imp 1241 : public common_type 1242 < 1243 decltype(__is_destructible_test(declval<_Tp>())) 1244 >::type {}; 1245 1246template <class _Tp> 1247struct __destructible_imp<_Tp, true> 1248 : public false_type {}; 1249 1250template <class _Tp> 1251struct is_destructible 1252 : public __destructible_imp<_Tp> {}; 1253 1254// move 1255 1256#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1257 1258template <class _Tp> 1259inline _LIBCPP_INLINE_VISIBILITY 1260typename remove_reference<_Tp>::type&& 1261move(_Tp&& __t) _NOEXCEPT 1262{ 1263 typedef typename remove_reference<_Tp>::type _Up; 1264 return static_cast<_Up&&>(__t); 1265} 1266 1267template <class _Tp> 1268inline _LIBCPP_INLINE_VISIBILITY 1269_Tp&& 1270forward(typename std::remove_reference<_Tp>::type& __t) _NOEXCEPT 1271{ 1272 return static_cast<_Tp&&>(__t); 1273} 1274 1275template <class _Tp> 1276inline _LIBCPP_INLINE_VISIBILITY 1277_Tp&& 1278forward(typename std::remove_reference<_Tp>::type&& __t) _NOEXCEPT 1279{ 1280 static_assert(!std::is_lvalue_reference<_Tp>::value, 1281 "Can not forward an rvalue as an lvalue."); 1282 return static_cast<_Tp&&>(__t); 1283} 1284 1285#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 1286 1287template <class _Tp> 1288class __rv 1289{ 1290 typedef typename remove_reference<_Tp>::type _Trr; 1291 _Trr& t_; 1292public: 1293 _LIBCPP_INLINE_VISIBILITY 1294 _Trr* operator->() {return &t_;} 1295 _LIBCPP_INLINE_VISIBILITY 1296 explicit __rv(_Trr& __t) : t_(__t) {} 1297}; 1298 1299template <class _Tp> 1300inline _LIBCPP_INLINE_VISIBILITY 1301typename enable_if 1302< 1303 !is_convertible<_Tp, __rv<_Tp> >::value, 1304 _Tp& 1305>::type 1306move(_Tp& __t) 1307{ 1308 return __t; 1309} 1310 1311template <class _Tp> 1312inline _LIBCPP_INLINE_VISIBILITY 1313typename enable_if 1314< 1315 is_convertible<_Tp, __rv<_Tp> >::value, 1316 _Tp 1317>::type 1318move(_Tp& __t) 1319{ 1320 return _Tp(__rv<_Tp>(__t)); 1321} 1322 1323template <class _Tp, class _Up> 1324inline _LIBCPP_INLINE_VISIBILITY 1325typename enable_if 1326< 1327 !is_convertible<_Tp, __rv<_Tp> >::value, 1328 typename add_lvalue_reference<_Tp>::type 1329>::type 1330forward(_Up& __t) 1331{ 1332 return __t; 1333} 1334 1335template <class _Tp, class _Up> 1336inline _LIBCPP_INLINE_VISIBILITY 1337typename enable_if 1338< 1339 !is_convertible<_Tp, __rv<_Tp> >::value, 1340 typename add_lvalue_reference<_Tp>::type 1341>::type 1342forward(const _Up& __t) 1343{ 1344 return __t; 1345} 1346 1347template <class _Tp, class _Up> 1348inline _LIBCPP_INLINE_VISIBILITY 1349typename enable_if 1350< 1351 is_convertible<_Tp, __rv<_Tp> >::value, 1352 _Tp 1353>::type 1354forward(_Up& __t) 1355{ 1356 return _Tp(__rv<_Tp>(__t)); 1357} 1358 1359template <class _Tp, class _Up> 1360inline _LIBCPP_INLINE_VISIBILITY 1361typename enable_if 1362< 1363 is_convertible<_Tp, __rv<_Tp> >::value, 1364 _Tp 1365>::type 1366forward(const _Up& __t) 1367{ 1368 return _Tp(__rv<_Tp>(__t)); 1369} 1370 1371#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 1372 1373template <class _Tp> 1374struct _LIBCPP_VISIBLE decay 1375{ 1376private: 1377 typedef typename remove_reference<_Tp>::type _Up; 1378public: 1379 typedef typename conditional 1380 < 1381 is_array<_Up>::value, 1382 typename remove_extent<_Up>::type*, 1383 typename conditional 1384 < 1385 is_function<_Up>::value, 1386 typename add_pointer<_Up>::type, 1387 typename remove_cv<_Up>::type 1388 >::type 1389 >::type type; 1390}; 1391 1392#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1393 1394template <class _Tp> 1395inline _LIBCPP_INLINE_VISIBILITY 1396typename decay<_Tp>::type 1397__decay_copy(_Tp&& __t) 1398{ 1399 return _VSTD::forward<_Tp>(__t); 1400} 1401 1402#else 1403 1404template <class _Tp> 1405inline _LIBCPP_INLINE_VISIBILITY 1406typename decay<_Tp>::type 1407__decay_copy(const _Tp& __t) 1408{ 1409 return _VSTD::forward<_Tp>(__t); 1410} 1411 1412#endif 1413 1414template <class _MP, bool _IsMemberFuctionPtr, bool _IsMemberObjectPtr> 1415struct __member_pointer_traits_imp 1416{ 1417}; 1418 1419#ifndef _LIBCPP_HAS_NO_VARIADICS 1420 1421template <class _R, class _Class, class ..._Param> 1422struct __member_pointer_traits_imp<_R (_Class::*)(_Param...), true, false> 1423{ 1424 typedef _Class _ClassType; 1425 typedef _R _ReturnType; 1426}; 1427 1428template <class _R, class _Class, class ..._Param> 1429struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const, true, false> 1430{ 1431 typedef _Class const _ClassType; 1432 typedef _R _ReturnType; 1433}; 1434 1435template <class _R, class _Class, class ..._Param> 1436struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) volatile, true, false> 1437{ 1438 typedef _Class volatile _ClassType; 1439 typedef _R _ReturnType; 1440}; 1441 1442template <class _R, class _Class, class ..._Param> 1443struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const volatile, true, false> 1444{ 1445 typedef _Class const volatile _ClassType; 1446 typedef _R _ReturnType; 1447}; 1448 1449#if __has_feature(cxx_reference_qualified_functions) 1450 1451template <class _R, class _Class, class ..._Param> 1452struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) &, true, false> 1453{ 1454 typedef _Class& _ClassType; 1455 typedef _R _ReturnType; 1456}; 1457 1458template <class _R, class _Class, class ..._Param> 1459struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const&, true, false> 1460{ 1461 typedef _Class const& _ClassType; 1462 typedef _R _ReturnType; 1463}; 1464 1465template <class _R, class _Class, class ..._Param> 1466struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) volatile&, true, false> 1467{ 1468 typedef _Class volatile& _ClassType; 1469 typedef _R _ReturnType; 1470}; 1471 1472template <class _R, class _Class, class ..._Param> 1473struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const volatile&, true, false> 1474{ 1475 typedef _Class const volatile& _ClassType; 1476 typedef _R _ReturnType; 1477}; 1478 1479template <class _R, class _Class, class ..._Param> 1480struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) &&, true, false> 1481{ 1482 typedef _Class&& _ClassType; 1483 typedef _R _ReturnType; 1484}; 1485 1486template <class _R, class _Class, class ..._Param> 1487struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const&&, true, false> 1488{ 1489 typedef _Class const&& _ClassType; 1490 typedef _R _ReturnType; 1491}; 1492 1493template <class _R, class _Class, class ..._Param> 1494struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) volatile&&, true, false> 1495{ 1496 typedef _Class volatile&& _ClassType; 1497 typedef _R _ReturnType; 1498}; 1499 1500template <class _R, class _Class, class ..._Param> 1501struct __member_pointer_traits_imp<_R (_Class::*)(_Param...) const volatile&&, true, false> 1502{ 1503 typedef _Class const volatile&& _ClassType; 1504 typedef _R _ReturnType; 1505}; 1506 1507#endif // __has_feature(cxx_reference_qualified_functions) 1508 1509#else // _LIBCPP_HAS_NO_VARIADICS 1510 1511template <class _R, class _Class> 1512struct __member_pointer_traits_imp<_R (_Class::*)(), true, false> 1513{ 1514 typedef _Class _ClassType; 1515 typedef _R _ReturnType; 1516}; 1517 1518template <class _R, class _Class, class _P0> 1519struct __member_pointer_traits_imp<_R (_Class::*)(_P0), true, false> 1520{ 1521 typedef _Class _ClassType; 1522 typedef _R _ReturnType; 1523}; 1524 1525template <class _R, class _Class, class _P0, class _P1> 1526struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1), true, false> 1527{ 1528 typedef _Class _ClassType; 1529 typedef _R _ReturnType; 1530}; 1531 1532template <class _R, class _Class, class _P0, class _P1, class _P2> 1533struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1, _P2), true, false> 1534{ 1535 typedef _Class _ClassType; 1536 typedef _R _ReturnType; 1537}; 1538 1539template <class _R, class _Class> 1540struct __member_pointer_traits_imp<_R (_Class::*)() const, true, false> 1541{ 1542 typedef _Class const _ClassType; 1543 typedef _R _ReturnType; 1544}; 1545 1546template <class _R, class _Class, class _P0> 1547struct __member_pointer_traits_imp<_R (_Class::*)(_P0) const, true, false> 1548{ 1549 typedef _Class const _ClassType; 1550 typedef _R _ReturnType; 1551}; 1552 1553template <class _R, class _Class, class _P0, class _P1> 1554struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1) const, true, false> 1555{ 1556 typedef _Class const _ClassType; 1557 typedef _R _ReturnType; 1558}; 1559 1560template <class _R, class _Class, class _P0, class _P1, class _P2> 1561struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1, _P2) const, true, false> 1562{ 1563 typedef _Class const _ClassType; 1564 typedef _R _ReturnType; 1565}; 1566 1567template <class _R, class _Class> 1568struct __member_pointer_traits_imp<_R (_Class::*)() volatile, true, false> 1569{ 1570 typedef _Class volatile _ClassType; 1571 typedef _R _ReturnType; 1572}; 1573 1574template <class _R, class _Class, class _P0> 1575struct __member_pointer_traits_imp<_R (_Class::*)(_P0) volatile, true, false> 1576{ 1577 typedef _Class volatile _ClassType; 1578 typedef _R _ReturnType; 1579}; 1580 1581template <class _R, class _Class, class _P0, class _P1> 1582struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1) volatile, true, false> 1583{ 1584 typedef _Class volatile _ClassType; 1585 typedef _R _ReturnType; 1586}; 1587 1588template <class _R, class _Class, class _P0, class _P1, class _P2> 1589struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1, _P2) volatile, true, false> 1590{ 1591 typedef _Class volatile _ClassType; 1592 typedef _R _ReturnType; 1593}; 1594 1595template <class _R, class _Class> 1596struct __member_pointer_traits_imp<_R (_Class::*)() const volatile, true, false> 1597{ 1598 typedef _Class const volatile _ClassType; 1599 typedef _R _ReturnType; 1600}; 1601 1602template <class _R, class _Class, class _P0> 1603struct __member_pointer_traits_imp<_R (_Class::*)(_P0) const volatile, true, false> 1604{ 1605 typedef _Class const volatile _ClassType; 1606 typedef _R _ReturnType; 1607}; 1608 1609template <class _R, class _Class, class _P0, class _P1> 1610struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1) const volatile, true, false> 1611{ 1612 typedef _Class const volatile _ClassType; 1613 typedef _R _ReturnType; 1614}; 1615 1616template <class _R, class _Class, class _P0, class _P1, class _P2> 1617struct __member_pointer_traits_imp<_R (_Class::*)(_P0, _P1, _P2) const volatile, true, false> 1618{ 1619 typedef _Class const volatile _ClassType; 1620 typedef _R _ReturnType; 1621}; 1622 1623#endif // _LIBCPP_HAS_NO_VARIADICS 1624 1625template <class _R, class _Class> 1626struct __member_pointer_traits_imp<_R _Class::*, false, true> 1627{ 1628 typedef _Class _ClassType; 1629 typedef _R _ReturnType; 1630}; 1631 1632template <class _MP> 1633struct __member_pointer_traits 1634 : public __member_pointer_traits_imp<_MP, 1635 is_member_function_pointer<_MP>::value, 1636 is_member_object_pointer<_MP>::value> 1637{ 1638// typedef ... _ClassType; 1639// typedef ... _ReturnType; 1640}; 1641 1642// result_of 1643 1644template <class _Callable> class result_of; 1645 1646template <class _Fn, bool, bool> 1647class __result_of 1648{ 1649}; 1650 1651#ifndef _LIBCPP_HAS_NO_VARIADICS 1652 1653template <class _Fn, class ..._ArgTypes> 1654class __result_of<_Fn(_ArgTypes...), true, false> 1655{ 1656public: 1657 typedef decltype(declval<_Fn>()(declval<_ArgTypes>()...)) type; 1658}; 1659 1660template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 1661struct __result_of_mp; 1662 1663// member function pointer 1664 1665template <class _MP, class _Tp> 1666struct __result_of_mp<_MP, _Tp, true> 1667 : public common_type<typename __member_pointer_traits<_MP>::_ReturnType> 1668{ 1669}; 1670 1671// member data pointer 1672 1673template <class _MP, class _Tp, bool> 1674struct __result_of_mdp; 1675 1676template <class _R, class _Class, class _Tp> 1677struct __result_of_mdp<_R _Class::*, _Tp, false> 1678{ 1679 typedef typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _R>::type&& type; 1680}; 1681 1682template <class _R, class _Class, class _Tp> 1683struct __result_of_mdp<_R _Class::*, _Tp, true> 1684{ 1685 typedef typename __apply_cv<_Tp, _R>::type&& type; 1686}; 1687 1688template <class _R, class _Class, class _Tp> 1689struct __result_of_mp<_R _Class::*, _Tp, false> 1690 : public __result_of_mdp<_R _Class::*, _Tp, 1691 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 1692{ 1693}; 1694 1695template <class _Fn, class _Tp, class ..._ArgTypes> 1696class __result_of<_Fn(_Tp, _ArgTypes...), false, true> // _Fn must be member pointer 1697 : public __result_of_mp<typename remove_reference<_Fn>::type, 1698 _Tp, 1699 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1700{ 1701}; 1702 1703// result_of 1704 1705template <class _Fn, class ..._ArgTypes> 1706class _LIBCPP_VISIBLE result_of<_Fn(_ArgTypes...)> 1707 : public __result_of<_Fn(_ArgTypes...), 1708 is_class<typename remove_reference<_Fn>::type>::value || 1709 is_function<typename remove_reference<_Fn>::type>::value, 1710 is_member_pointer<typename remove_reference<_Fn>::type>::value 1711 > 1712{ 1713}; 1714 1715#else // _LIBCPP_HAS_NO_VARIADICS 1716 1717template <class _Fn> 1718class __result_of<_Fn(), true, false> 1719{ 1720public: 1721 typedef decltype(declval<_Fn>()()) type; 1722}; 1723 1724template <class _Fn, class _A0> 1725class __result_of<_Fn(_A0), true, false> 1726{ 1727public: 1728 typedef decltype(declval<_Fn>()(declval<_A0>())) type; 1729}; 1730 1731template <class _Fn, class _A0, class _A1> 1732class __result_of<_Fn(_A0, _A1), true, false> 1733{ 1734public: 1735 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>())) type; 1736}; 1737 1738template <class _Fn, class _A0, class _A1, class _A2> 1739class __result_of<_Fn(_A0, _A1, _A2), true, false> 1740{ 1741public: 1742 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>(), declval<_A2>())) type; 1743}; 1744 1745template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 1746struct __result_of_mp; 1747 1748// member function pointer 1749 1750template <class _MP, class _Tp> 1751struct __result_of_mp<_MP, _Tp, true> 1752 : public common_type<typename __member_pointer_traits<_MP>::_ReturnType> 1753{ 1754}; 1755 1756// member data pointer 1757 1758template <class _MP, class _Tp, bool> 1759struct __result_of_mdp; 1760 1761template <class _R, class _Class, class _Tp> 1762struct __result_of_mdp<_R _Class::*, _Tp, false> 1763{ 1764 typedef typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _R>::type& type; 1765}; 1766 1767template <class _R, class _Class, class _Tp> 1768struct __result_of_mdp<_R _Class::*, _Tp, true> 1769{ 1770 typedef typename __apply_cv<_Tp, _R>::type& type; 1771}; 1772 1773template <class _R, class _Class, class _Tp> 1774struct __result_of_mp<_R _Class::*, _Tp, false> 1775 : public __result_of_mdp<_R _Class::*, _Tp, 1776 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 1777{ 1778}; 1779 1780 1781 1782template <class _Fn, class _Tp> 1783class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 1784 : public __result_of_mp<typename remove_reference<_Fn>::type, 1785 _Tp, 1786 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1787{ 1788}; 1789 1790template <class _Fn, class _Tp, class _A0> 1791class __result_of<_Fn(_Tp, _A0), false, true> // _Fn must be member pointer 1792 : public __result_of_mp<typename remove_reference<_Fn>::type, 1793 _Tp, 1794 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1795{ 1796}; 1797 1798template <class _Fn, class _Tp, class _A0, class _A1> 1799class __result_of<_Fn(_Tp, _A0, _A1), false, true> // _Fn must be member pointer 1800 : public __result_of_mp<typename remove_reference<_Fn>::type, 1801 _Tp, 1802 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1803{ 1804}; 1805 1806template <class _Fn, class _Tp, class _A0, class _A1, class _A2> 1807class __result_of<_Fn(_Tp, _A0, _A1, _A2), false, true> // _Fn must be member pointer 1808 : public __result_of_mp<typename remove_reference<_Fn>::type, 1809 _Tp, 1810 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1811{ 1812}; 1813 1814// result_of 1815 1816template <class _Fn> 1817class _LIBCPP_VISIBLE result_of<_Fn()> 1818 : public __result_of<_Fn(), 1819 is_class<typename remove_reference<_Fn>::type>::value || 1820 is_function<typename remove_reference<_Fn>::type>::value, 1821 is_member_pointer<typename remove_reference<_Fn>::type>::value 1822 > 1823{ 1824}; 1825 1826template <class _Fn, class _A0> 1827class _LIBCPP_VISIBLE result_of<_Fn(_A0)> 1828 : public __result_of<_Fn(_A0), 1829 is_class<typename remove_reference<_Fn>::type>::value || 1830 is_function<typename remove_reference<_Fn>::type>::value, 1831 is_member_pointer<typename remove_reference<_Fn>::type>::value 1832 > 1833{ 1834}; 1835 1836template <class _Fn, class _A0, class _A1> 1837class _LIBCPP_VISIBLE result_of<_Fn(_A0, _A1)> 1838 : public __result_of<_Fn(_A0, _A1), 1839 is_class<typename remove_reference<_Fn>::type>::value || 1840 is_function<typename remove_reference<_Fn>::type>::value, 1841 is_member_pointer<typename remove_reference<_Fn>::type>::value 1842 > 1843{ 1844}; 1845 1846template <class _Fn, class _A0, class _A1, class _A2> 1847class _LIBCPP_VISIBLE result_of<_Fn(_A0, _A1, _A2)> 1848 : public __result_of<_Fn(_A0, _A1, _A2), 1849 is_class<typename remove_reference<_Fn>::type>::value || 1850 is_function<typename remove_reference<_Fn>::type>::value, 1851 is_member_pointer<typename remove_reference<_Fn>::type>::value 1852 > 1853{ 1854}; 1855 1856#endif // _LIBCPP_HAS_NO_VARIADICS 1857 1858#ifndef _LIBCPP_HAS_NO_VARIADICS 1859 1860// template <class T, class... Args> struct is_constructible; 1861 1862// main is_constructible test 1863 1864template <class _Tp, class ..._Args> 1865decltype(_VSTD::move(_Tp(_VSTD::declval<_Args>()...)), true_type()) 1866__is_constructible_test(_Tp&&, _Args&& ...); 1867 1868template <class ..._Args> 1869false_type 1870__is_constructible_test(__any, _Args&& ...); 1871 1872template <bool, class _Tp, class... _Args> 1873struct __is_constructible // false, _Tp is not a scalar 1874 : public common_type 1875 < 1876 decltype(__is_constructible_test(declval<_Tp>(), declval<_Args>()...)) 1877 >::type 1878 {}; 1879 1880// function types are not constructible 1881 1882template <class _R, class... _A1, class... _A2> 1883struct __is_constructible<false, _R(_A1...), _A2...> 1884 : public false_type 1885 {}; 1886 1887// handle scalars and reference types 1888 1889// Scalars are default constructible, references are not 1890 1891template <class _Tp> 1892struct __is_constructible<true, _Tp> 1893 : public is_scalar<_Tp> 1894 {}; 1895 1896// Scalars and references are constructible from one arg if that arg is 1897// implicitly convertible to the scalar or reference. 1898 1899template <class _Tp> 1900struct __is_constructible_ref 1901{ 1902 true_type static __(_Tp); 1903 false_type static __(...); 1904}; 1905 1906template <class _Tp, class _A0> 1907struct __is_constructible<true, _Tp, _A0> 1908 : public common_type 1909 < 1910 decltype(__is_constructible_ref<_Tp>::__(declval<_A0>())) 1911 >::type 1912 {}; 1913 1914// Scalars and references are not constructible from multiple args. 1915 1916template <class _Tp, class _A0, class ..._Args> 1917struct __is_constructible<true, _Tp, _A0, _Args...> 1918 : public false_type 1919 {}; 1920 1921// Treat scalars and reference types separately 1922 1923template <bool, class _Tp, class... _Args> 1924struct __is_constructible_void_check 1925 : public __is_constructible<is_scalar<_Tp>::value || is_reference<_Tp>::value, 1926 _Tp, _Args...> 1927 {}; 1928 1929// If any of T or Args is void, is_constructible should be false 1930 1931template <class _Tp, class... _Args> 1932struct __is_constructible_void_check<true, _Tp, _Args...> 1933 : public false_type 1934 {}; 1935 1936template <class ..._Args> struct __contains_void; 1937 1938template <> struct __contains_void<> : false_type {}; 1939 1940template <class _A0, class ..._Args> 1941struct __contains_void<_A0, _Args...> 1942{ 1943 static const bool value = is_void<_A0>::value || 1944 __contains_void<_Args...>::value; 1945}; 1946 1947// is_constructible entry point 1948 1949template <class _Tp, class... _Args> 1950struct _LIBCPP_VISIBLE is_constructible 1951 : public __is_constructible_void_check<__contains_void<_Tp, _Args...>::value 1952 || is_abstract<_Tp>::value, 1953 _Tp, _Args...> 1954 {}; 1955 1956// Array types are default constructible if their element type 1957// is default constructible 1958 1959template <class _A, size_t _N> 1960struct __is_constructible<false, _A[_N]> 1961 : public is_constructible<typename remove_all_extents<_A>::type> 1962 {}; 1963 1964// Otherwise array types are not constructible by this syntax 1965 1966template <class _A, size_t _N, class ..._Args> 1967struct __is_constructible<false, _A[_N], _Args...> 1968 : public false_type 1969 {}; 1970 1971// Incomplete array types are not constructible 1972 1973template <class _A, class ..._Args> 1974struct __is_constructible<false, _A[], _Args...> 1975 : public false_type 1976 {}; 1977 1978#else // _LIBCPP_HAS_NO_VARIADICS 1979 1980// template <class T> struct is_constructible0; 1981 1982// main is_constructible0 test 1983 1984template <class _Tp> 1985decltype((_Tp(), true_type())) 1986__is_constructible0_test(_Tp&); 1987 1988false_type 1989__is_constructible0_test(__any); 1990 1991template <class _Tp, class _A0> 1992decltype((_Tp(_VSTD::declval<_A0>()), true_type())) 1993__is_constructible1_test(_Tp&, _A0&); 1994 1995template <class _A0> 1996false_type 1997__is_constructible1_test(__any, _A0&); 1998 1999template <class _Tp, class _A0, class _A1> 2000decltype((_Tp(_VSTD::declval<_A0>(), _VSTD::declval<_A1>()), true_type())) 2001__is_constructible2_test(_Tp&, _A0&, _A1&); 2002 2003template <class _A0, class _A1> 2004false_type 2005__is_constructible2_test(__any, _A0&, _A1&); 2006 2007template <bool, class _Tp> 2008struct __is_constructible0_imp // false, _Tp is not a scalar 2009 : public common_type 2010 < 2011 decltype(__is_constructible0_test(declval<_Tp&>())) 2012 >::type 2013 {}; 2014 2015template <bool, class _Tp, class _A0> 2016struct __is_constructible1_imp // false, _Tp is not a scalar 2017 : public common_type 2018 < 2019 decltype(__is_constructible1_test(declval<_Tp&>(), declval<_A0&>())) 2020 >::type 2021 {}; 2022 2023template <bool, class _Tp, class _A0, class _A1> 2024struct __is_constructible2_imp // false, _Tp is not a scalar 2025 : public common_type 2026 < 2027 decltype(__is_constructible2_test(declval<_Tp&>(), declval<_A0>(), declval<_A1>())) 2028 >::type 2029 {}; 2030 2031// handle scalars and reference types 2032 2033// Scalars are default constructible, references are not 2034 2035template <class _Tp> 2036struct __is_constructible0_imp<true, _Tp> 2037 : public is_scalar<_Tp> 2038 {}; 2039 2040template <class _Tp, class _A0> 2041struct __is_constructible1_imp<true, _Tp, _A0> 2042 : public is_convertible<_A0, _Tp> 2043 {}; 2044 2045template <class _Tp, class _A0, class _A1> 2046struct __is_constructible2_imp<true, _Tp, _A0, _A1> 2047 : public false_type 2048 {}; 2049 2050// Treat scalars and reference types separately 2051 2052template <bool, class _Tp> 2053struct __is_constructible0_void_check 2054 : public __is_constructible0_imp<is_scalar<_Tp>::value || is_reference<_Tp>::value, 2055 _Tp> 2056 {}; 2057 2058template <bool, class _Tp, class _A0> 2059struct __is_constructible1_void_check 2060 : public __is_constructible1_imp<is_scalar<_Tp>::value || is_reference<_Tp>::value, 2061 _Tp, _A0> 2062 {}; 2063 2064template <bool, class _Tp, class _A0, class _A1> 2065struct __is_constructible2_void_check 2066 : public __is_constructible2_imp<is_scalar<_Tp>::value || is_reference<_Tp>::value, 2067 _Tp, _A0, _A1> 2068 {}; 2069 2070// If any of T or Args is void, is_constructible should be false 2071 2072template <class _Tp> 2073struct __is_constructible0_void_check<true, _Tp> 2074 : public false_type 2075 {}; 2076 2077template <class _Tp, class _A0> 2078struct __is_constructible1_void_check<true, _Tp, _A0> 2079 : public false_type 2080 {}; 2081 2082template <class _Tp, class _A0, class _A1> 2083struct __is_constructible2_void_check<true, _Tp, _A0, _A1> 2084 : public false_type 2085 {}; 2086 2087// is_constructible entry point 2088 2089namespace __is_construct 2090{ 2091 2092struct __nat {}; 2093 2094} 2095 2096template <class _Tp, class _A0 = __is_construct::__nat, 2097 class _A1 = __is_construct::__nat> 2098struct _LIBCPP_VISIBLE is_constructible 2099 : public __is_constructible2_void_check<is_void<_Tp>::value 2100 || is_abstract<_Tp>::value 2101 || is_function<_Tp>::value 2102 || is_void<_A0>::value 2103 || is_void<_A1>::value, 2104 _Tp, _A0, _A1> 2105 {}; 2106 2107template <class _Tp> 2108struct _LIBCPP_VISIBLE is_constructible<_Tp, __is_construct::__nat, __is_construct::__nat> 2109 : public __is_constructible0_void_check<is_void<_Tp>::value 2110 || is_abstract<_Tp>::value 2111 || is_function<_Tp>::value, 2112 _Tp> 2113 {}; 2114 2115template <class _Tp, class _A0> 2116struct _LIBCPP_VISIBLE is_constructible<_Tp, _A0, __is_construct::__nat> 2117 : public __is_constructible1_void_check<is_void<_Tp>::value 2118 || is_abstract<_Tp>::value 2119 || is_function<_Tp>::value 2120 || is_void<_A0>::value, 2121 _Tp, _A0> 2122 {}; 2123 2124// Array types are default constructible if their element type 2125// is default constructible 2126 2127template <class _A, size_t _N> 2128struct __is_constructible0_imp<false, _A[_N]> 2129 : public is_constructible<typename remove_all_extents<_A>::type> 2130 {}; 2131 2132template <class _A, size_t _N, class _A0> 2133struct __is_constructible1_imp<false, _A[_N], _A0> 2134 : public false_type 2135 {}; 2136 2137template <class _A, size_t _N, class _A0, class _A1> 2138struct __is_constructible2_imp<false, _A[_N], _A0, _A1> 2139 : public false_type 2140 {}; 2141 2142// Incomplete array types are not constructible 2143 2144template <class _A> 2145struct __is_constructible0_imp<false, _A[]> 2146 : public false_type 2147 {}; 2148 2149template <class _A, class _A0> 2150struct __is_constructible1_imp<false, _A[], _A0> 2151 : public false_type 2152 {}; 2153 2154template <class _A, class _A0, class _A1> 2155struct __is_constructible2_imp<false, _A[], _A0, _A1> 2156 : public false_type 2157 {}; 2158 2159#endif // _LIBCPP_HAS_NO_VARIADICS 2160 2161// is_default_constructible 2162 2163template <class _Tp> 2164struct _LIBCPP_VISIBLE is_default_constructible 2165 : public is_constructible<_Tp> 2166 {}; 2167 2168// is_copy_constructible 2169 2170template <class _Tp> 2171struct _LIBCPP_VISIBLE is_copy_constructible 2172 : public is_constructible<_Tp, const typename add_lvalue_reference<_Tp>::type> 2173 {}; 2174 2175// is_move_constructible 2176 2177template <class _Tp> 2178struct _LIBCPP_VISIBLE is_move_constructible 2179#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2180 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2181#else 2182 : public is_copy_constructible<_Tp> 2183#endif 2184 {}; 2185 2186// is_trivially_constructible 2187 2188#ifndef _LIBCPP_HAS_NO_VARIADICS 2189 2190template <class _Tp, class... _Args> 2191struct _LIBCPP_VISIBLE is_trivially_constructible 2192 : false_type 2193{ 2194}; 2195 2196template <class _Tp> 2197struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp> 2198#if __has_feature(has_trivial_constructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2199 : integral_constant<bool, __has_trivial_constructor(_Tp)> 2200#else 2201 : integral_constant<bool, is_scalar<_Tp>::value> 2202#endif 2203{ 2204}; 2205 2206template <class _Tp> 2207#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2208struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, _Tp&&> 2209#else 2210struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, _Tp> 2211#endif 2212#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2213 : integral_constant<bool, __has_trivial_copy(_Tp)> 2214#else 2215 : integral_constant<bool, is_scalar<_Tp>::value> 2216#endif 2217{ 2218}; 2219 2220template <class _Tp> 2221struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, const _Tp&> 2222#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2223 : integral_constant<bool, __has_trivial_copy(_Tp)> 2224#else 2225 : integral_constant<bool, is_scalar<_Tp>::value> 2226#endif 2227{ 2228}; 2229 2230template <class _Tp> 2231struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, _Tp&> 2232#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2233 : integral_constant<bool, __has_trivial_copy(_Tp)> 2234#else 2235 : integral_constant<bool, is_scalar<_Tp>::value> 2236#endif 2237{ 2238}; 2239 2240#else // _LIBCPP_HAS_NO_VARIADICS 2241 2242template <class _Tp, class _A0 = __is_construct::__nat, 2243 class _A1 = __is_construct::__nat> 2244struct _LIBCPP_VISIBLE is_trivially_constructible 2245 : false_type 2246{ 2247}; 2248 2249template <class _Tp> 2250struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, __is_construct::__nat, 2251 __is_construct::__nat> 2252#if __has_feature(has_trivial_constructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2253 : integral_constant<bool, __has_trivial_constructor(_Tp)> 2254#else 2255 : integral_constant<bool, is_scalar<_Tp>::value> 2256#endif 2257{ 2258}; 2259 2260template <class _Tp> 2261struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, _Tp, 2262 __is_construct::__nat> 2263#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2264 : integral_constant<bool, __has_trivial_copy(_Tp)> 2265#else 2266 : integral_constant<bool, is_scalar<_Tp>::value> 2267#endif 2268{ 2269}; 2270 2271template <class _Tp> 2272struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, const _Tp&, 2273 __is_construct::__nat> 2274#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2275 : integral_constant<bool, __has_trivial_copy(_Tp)> 2276#else 2277 : integral_constant<bool, is_scalar<_Tp>::value> 2278#endif 2279{ 2280}; 2281 2282template <class _Tp> 2283struct _LIBCPP_VISIBLE is_trivially_constructible<_Tp, _Tp&, 2284 __is_construct::__nat> 2285#if __has_feature(has_trivial_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2286 : integral_constant<bool, __has_trivial_copy(_Tp)> 2287#else 2288 : integral_constant<bool, is_scalar<_Tp>::value> 2289#endif 2290{ 2291}; 2292 2293#endif // _LIBCPP_HAS_NO_VARIADICS 2294 2295// is_trivially_default_constructible 2296 2297template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_default_constructible 2298 : public is_trivially_constructible<_Tp> 2299 {}; 2300 2301// is_trivially_copy_constructible 2302 2303template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_copy_constructible 2304 : public is_trivially_constructible<_Tp, const typename add_lvalue_reference<_Tp>::type> 2305 {}; 2306 2307// is_trivially_move_constructible 2308 2309template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_move_constructible 2310#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2311 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2312#else 2313 : public is_trivially_copy_constructible<_Tp> 2314#endif 2315 {}; 2316 2317// is_trivially_assignable 2318 2319template <class _Tp, class _Arg> 2320struct is_trivially_assignable 2321 : public false_type {}; 2322 2323template <class _Tp> 2324struct is_trivially_assignable<_Tp&, _Tp> 2325#if __has_feature(has_trivial_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2326 : integral_constant<bool, __has_trivial_assign(_Tp)> {}; 2327#else 2328 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2329#endif 2330 2331template <class _Tp> 2332struct is_trivially_assignable<_Tp&, _Tp&> 2333#if __has_feature(has_trivial_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2334 : integral_constant<bool, __has_trivial_assign(_Tp)> {}; 2335#else 2336 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2337#endif 2338 2339template <class _Tp> 2340struct is_trivially_assignable<_Tp&, const _Tp&> 2341#if __has_feature(has_trivial_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2342 : integral_constant<bool, __has_trivial_assign(_Tp)> {}; 2343#else 2344 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2345#endif 2346 2347#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2348 2349template <class _Tp> 2350struct is_trivially_assignable<_Tp&, _Tp&&> 2351#if __has_feature(has_trivial_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2352 : integral_constant<bool, __has_trivial_assign(_Tp)> {}; 2353#else 2354 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2355#endif 2356 2357#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 2358 2359// is_trivially_copy_assignable 2360 2361template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_copy_assignable 2362 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 2363 const typename add_lvalue_reference<_Tp>::type> 2364 {}; 2365 2366// is_trivially_move_assignable 2367 2368template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_move_assignable 2369 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 2370#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2371 typename add_rvalue_reference<_Tp>::type> 2372#else 2373 typename add_lvalue_reference<_Tp>::type> 2374#endif 2375 {}; 2376 2377// is_trivially_destructible 2378 2379#if __has_feature(has_trivial_destructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2380 2381template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_destructible 2382 : public integral_constant<bool, __has_trivial_destructor(_Tp)> {}; 2383 2384#else // _LIBCPP_HAS_TYPE_TRAITS 2385 2386template <class _Tp> struct __libcpp_trivial_destructor 2387 : public integral_constant<bool, is_scalar<_Tp>::value || 2388 is_reference<_Tp>::value> {}; 2389 2390template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_destructible 2391 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 2392 2393#endif // _LIBCPP_HAS_TYPE_TRAITS 2394 2395// is_nothrow_constructible 2396 2397#ifndef _LIBCPP_HAS_NO_VARIADICS 2398 2399#if __has_feature(cxx_noexcept) 2400 2401template <bool, class _Tp, class... _Args> struct __is_nothrow_constructible; 2402 2403template <class _Tp, class... _Args> 2404struct __is_nothrow_constructible<true, _Tp, _Args...> 2405 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 2406{ 2407}; 2408 2409template <class _Tp, class... _Args> 2410struct __is_nothrow_constructible<false, _Tp, _Args...> 2411 : public false_type 2412{ 2413}; 2414 2415template <class _Tp, class... _Args> 2416struct _LIBCPP_VISIBLE is_nothrow_constructible 2417 : __is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, _Tp, _Args...> 2418{ 2419}; 2420 2421template <class _Tp, size_t _Ns> 2422struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp[_Ns]> 2423 : __is_nothrow_constructible<is_constructible<_Tp>::value, _Tp> 2424{ 2425}; 2426 2427#else // __has_feature(cxx_noexcept) 2428 2429template <class _Tp, class... _Args> 2430struct _LIBCPP_VISIBLE is_nothrow_constructible 2431 : false_type 2432{ 2433}; 2434 2435template <class _Tp> 2436struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp> 2437#if __has_feature(has_nothrow_constructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2438 : integral_constant<bool, __has_nothrow_constructor(_Tp)> 2439#else 2440 : integral_constant<bool, is_scalar<_Tp>::value> 2441#endif 2442{ 2443}; 2444 2445template <class _Tp> 2446#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2447struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp&&> 2448#else 2449struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp> 2450#endif 2451#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2452 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2453#else 2454 : integral_constant<bool, is_scalar<_Tp>::value> 2455#endif 2456{ 2457}; 2458 2459template <class _Tp> 2460struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, const _Tp&> 2461#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2462 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2463#else 2464 : integral_constant<bool, is_scalar<_Tp>::value> 2465#endif 2466{ 2467}; 2468 2469template <class _Tp> 2470struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp&> 2471#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2472 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2473#else 2474 : integral_constant<bool, is_scalar<_Tp>::value> 2475#endif 2476{ 2477}; 2478 2479#endif // __has_feature(cxx_noexcept) 2480 2481#else // _LIBCPP_HAS_NO_VARIADICS 2482 2483template <class _Tp, class _A0 = __is_construct::__nat, 2484 class _A1 = __is_construct::__nat> 2485struct _LIBCPP_VISIBLE is_nothrow_constructible 2486 : false_type 2487{ 2488}; 2489 2490template <class _Tp> 2491struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, __is_construct::__nat, 2492 __is_construct::__nat> 2493#if __has_feature(has_nothrow_constructor) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2494 : integral_constant<bool, __has_nothrow_constructor(_Tp)> 2495#else 2496 : integral_constant<bool, is_scalar<_Tp>::value> 2497#endif 2498{ 2499}; 2500 2501template <class _Tp> 2502struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp, 2503 __is_construct::__nat> 2504#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2505 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2506#else 2507 : integral_constant<bool, is_scalar<_Tp>::value> 2508#endif 2509{ 2510}; 2511 2512template <class _Tp> 2513struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, const _Tp&, 2514 __is_construct::__nat> 2515#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2516 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2517#else 2518 : integral_constant<bool, is_scalar<_Tp>::value> 2519#endif 2520{ 2521}; 2522 2523template <class _Tp> 2524struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp&, 2525 __is_construct::__nat> 2526#if __has_feature(has_nothrow_copy) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2527 : integral_constant<bool, __has_nothrow_copy(_Tp)> 2528#else 2529 : integral_constant<bool, is_scalar<_Tp>::value> 2530#endif 2531{ 2532}; 2533 2534#endif // _LIBCPP_HAS_NO_VARIADICS 2535 2536// is_nothrow_default_constructible 2537 2538template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_default_constructible 2539 : public is_nothrow_constructible<_Tp> 2540 {}; 2541 2542// is_nothrow_copy_constructible 2543 2544template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_copy_constructible 2545 : public is_nothrow_constructible<_Tp, const typename add_lvalue_reference<_Tp>::type> 2546 {}; 2547 2548// is_nothrow_move_constructible 2549 2550template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_move_constructible 2551#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2552 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2553#else 2554 : public is_nothrow_copy_constructible<_Tp> 2555#endif 2556 {}; 2557 2558// is_nothrow_assignable 2559 2560#if __has_feature(cxx_noexcept) 2561 2562template <bool, class _Tp, class _Arg> struct __is_nothrow_assignable; 2563 2564template <class _Tp, class _Arg> 2565struct __is_nothrow_assignable<false, _Tp, _Arg> 2566 : public false_type 2567{ 2568}; 2569 2570template <class _Tp, class _Arg> 2571struct __is_nothrow_assignable<true, _Tp, _Arg> 2572 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>()) > 2573{ 2574}; 2575 2576template <class _Tp, class _Arg> 2577struct _LIBCPP_VISIBLE is_nothrow_assignable 2578 : public __is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 2579{ 2580}; 2581 2582#else // __has_feature(cxx_noexcept) 2583 2584template <class _Tp, class _Arg> 2585struct _LIBCPP_VISIBLE is_nothrow_assignable 2586 : public false_type {}; 2587 2588template <class _Tp> 2589struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, _Tp> 2590#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2591 : integral_constant<bool, __has_nothrow_assign(_Tp)> {}; 2592#else 2593 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2594#endif 2595 2596template <class _Tp> 2597struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, _Tp&> 2598#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2599 : integral_constant<bool, __has_nothrow_assign(_Tp)> {}; 2600#else 2601 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2602#endif 2603 2604template <class _Tp> 2605struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, const _Tp&> 2606#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2607 : integral_constant<bool, __has_nothrow_assign(_Tp)> {}; 2608#else 2609 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2610#endif 2611 2612#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2613 2614template <class _Tp> 2615struct is_nothrow_assignable<_Tp&, _Tp&&> 2616#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2617 : integral_constant<bool, __has_nothrow_assign(_Tp)> {}; 2618#else 2619 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2620#endif 2621 2622#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 2623 2624#endif // __has_feature(cxx_noexcept) 2625 2626// is_nothrow_copy_assignable 2627 2628template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_copy_assignable 2629 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 2630 const typename add_lvalue_reference<_Tp>::type> 2631 {}; 2632 2633// is_nothrow_move_assignable 2634 2635template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_move_assignable 2636 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 2637#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2638 typename add_rvalue_reference<_Tp>::type> 2639#else 2640 typename add_lvalue_reference<_Tp>::type> 2641#endif 2642 {}; 2643 2644// is_nothrow_destructible 2645 2646#if __has_feature(cxx_noexcept) 2647 2648template <bool, class _Tp> struct __is_nothrow_destructible; 2649 2650template <class _Tp> 2651struct __is_nothrow_destructible<false, _Tp> 2652 : public false_type 2653{ 2654}; 2655 2656template <class _Tp> 2657struct __is_nothrow_destructible<true, _Tp> 2658 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>().~_Tp()) > 2659{ 2660}; 2661 2662template <class _Tp> 2663struct _LIBCPP_VISIBLE is_nothrow_destructible 2664 : public __is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 2665{ 2666}; 2667 2668template <class _Tp, size_t _Ns> 2669struct _LIBCPP_VISIBLE is_nothrow_destructible<_Tp[_Ns]> 2670 : public is_nothrow_destructible<_Tp> 2671{ 2672}; 2673 2674template <class _Tp> 2675struct _LIBCPP_VISIBLE is_nothrow_destructible<_Tp&> 2676 : public true_type 2677{ 2678}; 2679 2680#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 2681 2682template <class _Tp> 2683struct _LIBCPP_VISIBLE is_nothrow_destructible<_Tp&&> 2684 : public true_type 2685{ 2686}; 2687 2688#endif 2689 2690#else 2691 2692template <class _Tp> struct __libcpp_nothrow_destructor 2693 : public integral_constant<bool, is_scalar<_Tp>::value || 2694 is_reference<_Tp>::value> {}; 2695 2696template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_destructible 2697 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 2698 2699#endif 2700 2701// is_pod 2702 2703#if __has_feature(is_pod) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 2704 2705template <class _Tp> struct _LIBCPP_VISIBLE is_pod 2706 : public integral_constant<bool, __is_pod(_Tp)> {}; 2707 2708#else // _LIBCPP_HAS_TYPE_TRAITS 2709 2710template <class _Tp> struct _LIBCPP_VISIBLE is_pod 2711 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 2712 is_trivially_copy_constructible<_Tp>::value && 2713 is_trivially_copy_assignable<_Tp>::value && 2714 is_trivially_destructible<_Tp>::value> {}; 2715 2716#endif // _LIBCPP_HAS_TYPE_TRAITS 2717 2718// is_literal_type; 2719 2720template <class _Tp> struct _LIBCPP_VISIBLE is_literal_type 2721#if __has_feature(is_literal) 2722 : public integral_constant<bool, __is_literal(_Tp)> 2723#else 2724 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value || 2725 is_reference<typename remove_all_extents<_Tp>::type>::value> 2726#endif 2727 {}; 2728 2729// is_standard_layout; 2730 2731template <class _Tp> struct _LIBCPP_VISIBLE is_standard_layout 2732#if __has_feature(is_standard_layout) 2733 : public integral_constant<bool, __is_standard_layout(_Tp)> 2734#else 2735 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 2736#endif 2737 {}; 2738 2739// is_trivially_copyable; 2740 2741template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_copyable 2742#if __has_feature(is_trivially_copyable) 2743 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 2744#else 2745 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 2746#endif 2747 {}; 2748 2749// is_trivial; 2750 2751template <class _Tp> struct _LIBCPP_VISIBLE is_trivial 2752#if __has_feature(is_trivial) 2753 : public integral_constant<bool, __is_trivial(_Tp)> 2754#else 2755 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 2756 is_trivially_default_constructible<_Tp>::value> 2757#endif 2758 {}; 2759 2760#ifndef _LIBCPP_HAS_NO_VARIADICS 2761 2762// Check for complete types 2763 2764template <class ..._T> struct __check_complete; 2765 2766template <> 2767struct __check_complete<> 2768{ 2769}; 2770 2771template <class _H, class _T0, class ..._T> 2772struct __check_complete<_H, _T0, _T...> 2773 : private __check_complete<_H>, 2774 private __check_complete<_T0, _T...> 2775{ 2776}; 2777 2778template <class _H> 2779struct __check_complete<_H, _H> 2780 : private __check_complete<_H> 2781{ 2782}; 2783 2784template <class _T> 2785struct __check_complete<_T> 2786{ 2787 static_assert(sizeof(_T) > 0, "Type must be complete."); 2788}; 2789 2790template <class _T> 2791struct __check_complete<_T&> 2792 : private __check_complete<_T> 2793{ 2794}; 2795 2796template <class _T> 2797struct __check_complete<_T&&> 2798 : private __check_complete<_T> 2799{ 2800}; 2801 2802template <class _R, class ..._Param> 2803struct __check_complete<_R (*)(_Param...)> 2804 : private __check_complete<_Param...> 2805{ 2806}; 2807 2808template <class _R, class ..._Param> 2809struct __check_complete<_R (_Param...)> 2810 : private __check_complete<_Param...> 2811{ 2812}; 2813 2814template <class _R, class _Class, class ..._Param> 2815struct __check_complete<_R (_Class::*)(_Param...)> 2816 : private __check_complete<_Class, _Param...> 2817{ 2818}; 2819 2820template <class _R, class _Class, class ..._Param> 2821struct __check_complete<_R (_Class::*)(_Param...) const> 2822 : private __check_complete<_Class, _Param...> 2823{ 2824}; 2825 2826template <class _R, class _Class, class ..._Param> 2827struct __check_complete<_R (_Class::*)(_Param...) volatile> 2828 : private __check_complete<_Class, _Param...> 2829{ 2830}; 2831 2832template <class _R, class _Class, class ..._Param> 2833struct __check_complete<_R (_Class::*)(_Param...) const volatile> 2834 : private __check_complete<_Class, _Param...> 2835{ 2836}; 2837 2838#if __has_feature(cxx_reference_qualified_functions) 2839 2840template <class _R, class _Class, class ..._Param> 2841struct __check_complete<_R (_Class::*)(_Param...) &> 2842 : private __check_complete<_Class, _Param...> 2843{ 2844}; 2845 2846template <class _R, class _Class, class ..._Param> 2847struct __check_complete<_R (_Class::*)(_Param...) const&> 2848 : private __check_complete<_Class, _Param...> 2849{ 2850}; 2851 2852template <class _R, class _Class, class ..._Param> 2853struct __check_complete<_R (_Class::*)(_Param...) volatile&> 2854 : private __check_complete<_Class, _Param...> 2855{ 2856}; 2857 2858template <class _R, class _Class, class ..._Param> 2859struct __check_complete<_R (_Class::*)(_Param...) const volatile&> 2860 : private __check_complete<_Class, _Param...> 2861{ 2862}; 2863 2864template <class _R, class _Class, class ..._Param> 2865struct __check_complete<_R (_Class::*)(_Param...) &&> 2866 : private __check_complete<_Class, _Param...> 2867{ 2868}; 2869 2870template <class _R, class _Class, class ..._Param> 2871struct __check_complete<_R (_Class::*)(_Param...) const&&> 2872 : private __check_complete<_Class, _Param...> 2873{ 2874}; 2875 2876template <class _R, class _Class, class ..._Param> 2877struct __check_complete<_R (_Class::*)(_Param...) volatile&&> 2878 : private __check_complete<_Class, _Param...> 2879{ 2880}; 2881 2882template <class _R, class _Class, class ..._Param> 2883struct __check_complete<_R (_Class::*)(_Param...) const volatile&&> 2884 : private __check_complete<_Class, _Param...> 2885{ 2886}; 2887 2888#endif 2889 2890template <class _R, class _Class> 2891struct __check_complete<_R _Class::*> 2892 : private __check_complete<_Class> 2893{ 2894}; 2895 2896// __invoke forward declarations 2897 2898// fall back - none of the bullets 2899 2900template <class ..._Args> 2901auto 2902__invoke(__any, _Args&& ...__args) 2903 -> __nat; 2904 2905// bullets 1 and 2 2906 2907template <class _F, class _A0, class ..._Args> 2908auto 2909__invoke(_F&& __f, _A0&& __a0, _Args&& ...__args) 2910 -> decltype((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)); 2911 2912template <class _F, class _A0, class ..._Args> 2913auto 2914__invoke(_F&& __f, _A0&& __a0, _Args&& ...__args) 2915 -> decltype(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)); 2916 2917// bullets 3 and 4 2918 2919template <class _F, class _A0> 2920auto 2921__invoke(_F&& __f, _A0&& __a0) 2922 -> decltype(_VSTD::forward<_A0>(__a0).*__f); 2923 2924template <class _F, class _A0> 2925auto 2926__invoke(_F&& __f, _A0&& __a0) 2927 -> decltype((*_VSTD::forward<_A0>(__a0)).*__f); 2928 2929// bullet 5 2930 2931template <class _F, class ..._Args> 2932auto 2933__invoke(_F&& __f, _Args&& ...__args) 2934 -> decltype(_VSTD::forward<_F>(__f)(_VSTD::forward<_Args>(__args)...)); 2935 2936// __invokable 2937 2938template <class _F, class ..._Args> 2939struct __invokable_imp 2940 : private __check_complete<_F, _Args...> 2941{ 2942 typedef decltype( 2943 __invoke(_VSTD::declval<_F>(), _VSTD::declval<_Args>()...) 2944 ) type; 2945 static const bool value = !is_same<type, __nat>::value; 2946}; 2947 2948template <class _F, class ..._Args> 2949struct __invokable 2950 : public integral_constant<bool, 2951 __invokable_imp<_F, _Args...>::value> 2952{ 2953}; 2954 2955// __invoke_of 2956 2957template <bool _Invokable, class _F, class ..._Args> 2958struct __invoke_of_imp // false 2959{ 2960}; 2961 2962template <class _F, class ..._Args> 2963struct __invoke_of_imp<true, _F, _Args...> 2964{ 2965 typedef typename __invokable_imp<_F, _Args...>::type type; 2966}; 2967 2968template <class _F, class ..._Args> 2969struct __invoke_of 2970 : public __invoke_of_imp<__invokable<_F, _Args...>::value, _F, _Args...> 2971{ 2972}; 2973 2974#endif // _LIBCPP_HAS_NO_VARIADICS 2975 2976template <class _Tp> 2977inline _LIBCPP_INLINE_VISIBILITY 2978#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 2979typename enable_if 2980< 2981 is_move_constructible<_Tp>::value && 2982 is_move_assignable<_Tp>::value 2983>::type 2984#else 2985void 2986#endif 2987swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 2988 is_nothrow_move_assignable<_Tp>::value) 2989{ 2990 _Tp __t(_VSTD::move(__x)); 2991 __x = _VSTD::move(__y); 2992 __y = _VSTD::move(__t); 2993} 2994 2995template <class _ForwardIterator1, class _ForwardIterator2> 2996inline _LIBCPP_INLINE_VISIBILITY 2997void 2998iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b) 2999 // _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b))) 3000 _NOEXCEPT_(_NOEXCEPT_(swap(*_VSTD::declval<_ForwardIterator1>(), 3001 *_VSTD::declval<_ForwardIterator2>()))) 3002{ 3003 swap(*__a, *__b); 3004} 3005 3006// __swappable 3007 3008namespace __detail 3009{ 3010 3011using _VSTD::swap; 3012__nat swap(__any, __any); 3013 3014template <class _Tp> 3015struct __swappable 3016{ 3017 typedef decltype(swap(_VSTD::declval<_Tp&>(), _VSTD::declval<_Tp&>())) type; 3018 static const bool value = !is_same<type, __nat>::value; 3019}; 3020 3021} // __detail 3022 3023template <class _Tp> 3024struct __is_swappable 3025 : public integral_constant<bool, __detail::__swappable<_Tp>::value> 3026{ 3027}; 3028 3029#if __has_feature(cxx_noexcept) 3030 3031template <bool, class _Tp> 3032struct __is_nothrow_swappable_imp 3033 : public integral_constant<bool, noexcept(swap(_VSTD::declval<_Tp&>(), 3034 _VSTD::declval<_Tp&>()))> 3035{ 3036}; 3037 3038template <class _Tp> 3039struct __is_nothrow_swappable_imp<false, _Tp> 3040 : public false_type 3041{ 3042}; 3043 3044template <class _Tp> 3045struct __is_nothrow_swappable 3046 : public __is_nothrow_swappable_imp<__is_swappable<_Tp>::value, _Tp> 3047{ 3048}; 3049 3050#else // __has_feature(cxx_noexcept) 3051 3052template <class _Tp> 3053struct __is_nothrow_swappable 3054 : public false_type 3055{ 3056}; 3057 3058#endif // __has_feature(cxx_noexcept) 3059 3060#ifdef _LIBCXX_UNDERLYING_TYPE 3061 3062template <class _Tp> 3063struct underlying_type 3064{ 3065 typedef _LIBCXX_UNDERLYING_TYPE(_Tp) type; 3066}; 3067 3068#else // _LIBCXX_UNDERLYING_TYPE 3069 3070template <class _Tp, bool _Support = false> 3071struct underlying_type 3072{ 3073 static_assert(_Support, "The underyling_type trait requires compiler " 3074 "support. Either no such support exists or " 3075 "libc++ does not know how to use it."); 3076}; 3077 3078#endif // _LIBCXX_UNDERLYING_TYPE 3079 3080_LIBCPP_END_NAMESPACE_STD 3081 3082#endif // _LIBCPP_TYPE_TRAITS 3083