__functional_base revision 360784
1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_FUNCTIONAL_BASE 11#define _LIBCPP_FUNCTIONAL_BASE 12 13#include <__config> 14#include <type_traits> 15#include <typeinfo> 16#include <exception> 17#include <new> 18#include <utility> 19 20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21#pragma GCC system_header 22#endif 23 24_LIBCPP_BEGIN_NAMESPACE_STD 25 26template <class _Arg1, class _Arg2, class _Result> 27struct _LIBCPP_TEMPLATE_VIS binary_function 28{ 29 typedef _Arg1 first_argument_type; 30 typedef _Arg2 second_argument_type; 31 typedef _Result result_type; 32}; 33 34template <class _Tp> 35struct __has_result_type 36{ 37private: 38 struct __two {char __lx; char __lxx;}; 39 template <class _Up> static __two __test(...); 40 template <class _Up> static char __test(typename _Up::result_type* = 0); 41public: 42 static const bool value = sizeof(__test<_Tp>(0)) == 1; 43}; 44 45#if _LIBCPP_STD_VER > 11 46template <class _Tp = void> 47#else 48template <class _Tp> 49#endif 50struct _LIBCPP_TEMPLATE_VIS less : binary_function<_Tp, _Tp, bool> 51{ 52 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 53 bool operator()(const _Tp& __x, const _Tp& __y) const 54 {return __x < __y;} 55}; 56 57#if _LIBCPP_STD_VER > 11 58template <> 59struct _LIBCPP_TEMPLATE_VIS less<void> 60{ 61 template <class _T1, class _T2> 62 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 63 auto operator()(_T1&& __t, _T2&& __u) const 64 _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u))) 65 -> decltype (_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u)) 66 { return _VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u); } 67 typedef void is_transparent; 68}; 69#endif 70 71// __weak_result_type 72 73template <class _Tp> 74struct __derives_from_unary_function 75{ 76private: 77 struct __two {char __lx; char __lxx;}; 78 static __two __test(...); 79 template <class _Ap, class _Rp> 80 static unary_function<_Ap, _Rp> 81 __test(const volatile unary_function<_Ap, _Rp>*); 82public: 83 static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value; 84 typedef decltype(__test((_Tp*)0)) type; 85}; 86 87template <class _Tp> 88struct __derives_from_binary_function 89{ 90private: 91 struct __two {char __lx; char __lxx;}; 92 static __two __test(...); 93 template <class _A1, class _A2, class _Rp> 94 static binary_function<_A1, _A2, _Rp> 95 __test(const volatile binary_function<_A1, _A2, _Rp>*); 96public: 97 static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value; 98 typedef decltype(__test((_Tp*)0)) type; 99}; 100 101template <class _Tp, bool = __derives_from_unary_function<_Tp>::value> 102struct __maybe_derive_from_unary_function // bool is true 103 : public __derives_from_unary_function<_Tp>::type 104{ 105}; 106 107template <class _Tp> 108struct __maybe_derive_from_unary_function<_Tp, false> 109{ 110}; 111 112template <class _Tp, bool = __derives_from_binary_function<_Tp>::value> 113struct __maybe_derive_from_binary_function // bool is true 114 : public __derives_from_binary_function<_Tp>::type 115{ 116}; 117 118template <class _Tp> 119struct __maybe_derive_from_binary_function<_Tp, false> 120{ 121}; 122 123template <class _Tp, bool = __has_result_type<_Tp>::value> 124struct __weak_result_type_imp // bool is true 125 : public __maybe_derive_from_unary_function<_Tp>, 126 public __maybe_derive_from_binary_function<_Tp> 127{ 128 typedef _LIBCPP_NODEBUG_TYPE typename _Tp::result_type result_type; 129}; 130 131template <class _Tp> 132struct __weak_result_type_imp<_Tp, false> 133 : public __maybe_derive_from_unary_function<_Tp>, 134 public __maybe_derive_from_binary_function<_Tp> 135{ 136}; 137 138template <class _Tp> 139struct __weak_result_type 140 : public __weak_result_type_imp<_Tp> 141{ 142}; 143 144// 0 argument case 145 146template <class _Rp> 147struct __weak_result_type<_Rp ()> 148{ 149 typedef _LIBCPP_NODEBUG_TYPE _Rp result_type; 150}; 151 152template <class _Rp> 153struct __weak_result_type<_Rp (&)()> 154{ 155 typedef _LIBCPP_NODEBUG_TYPE _Rp result_type; 156}; 157 158template <class _Rp> 159struct __weak_result_type<_Rp (*)()> 160{ 161 typedef _LIBCPP_NODEBUG_TYPE _Rp result_type; 162}; 163 164// 1 argument case 165 166template <class _Rp, class _A1> 167struct __weak_result_type<_Rp (_A1)> 168 : public unary_function<_A1, _Rp> 169{ 170}; 171 172template <class _Rp, class _A1> 173struct __weak_result_type<_Rp (&)(_A1)> 174 : public unary_function<_A1, _Rp> 175{ 176}; 177 178template <class _Rp, class _A1> 179struct __weak_result_type<_Rp (*)(_A1)> 180 : public unary_function<_A1, _Rp> 181{ 182}; 183 184template <class _Rp, class _Cp> 185struct __weak_result_type<_Rp (_Cp::*)()> 186 : public unary_function<_Cp*, _Rp> 187{ 188}; 189 190template <class _Rp, class _Cp> 191struct __weak_result_type<_Rp (_Cp::*)() const> 192 : public unary_function<const _Cp*, _Rp> 193{ 194}; 195 196template <class _Rp, class _Cp> 197struct __weak_result_type<_Rp (_Cp::*)() volatile> 198 : public unary_function<volatile _Cp*, _Rp> 199{ 200}; 201 202template <class _Rp, class _Cp> 203struct __weak_result_type<_Rp (_Cp::*)() const volatile> 204 : public unary_function<const volatile _Cp*, _Rp> 205{ 206}; 207 208// 2 argument case 209 210template <class _Rp, class _A1, class _A2> 211struct __weak_result_type<_Rp (_A1, _A2)> 212 : public binary_function<_A1, _A2, _Rp> 213{ 214}; 215 216template <class _Rp, class _A1, class _A2> 217struct __weak_result_type<_Rp (*)(_A1, _A2)> 218 : public binary_function<_A1, _A2, _Rp> 219{ 220}; 221 222template <class _Rp, class _A1, class _A2> 223struct __weak_result_type<_Rp (&)(_A1, _A2)> 224 : public binary_function<_A1, _A2, _Rp> 225{ 226}; 227 228template <class _Rp, class _Cp, class _A1> 229struct __weak_result_type<_Rp (_Cp::*)(_A1)> 230 : public binary_function<_Cp*, _A1, _Rp> 231{ 232}; 233 234template <class _Rp, class _Cp, class _A1> 235struct __weak_result_type<_Rp (_Cp::*)(_A1) const> 236 : public binary_function<const _Cp*, _A1, _Rp> 237{ 238}; 239 240template <class _Rp, class _Cp, class _A1> 241struct __weak_result_type<_Rp (_Cp::*)(_A1) volatile> 242 : public binary_function<volatile _Cp*, _A1, _Rp> 243{ 244}; 245 246template <class _Rp, class _Cp, class _A1> 247struct __weak_result_type<_Rp (_Cp::*)(_A1) const volatile> 248 : public binary_function<const volatile _Cp*, _A1, _Rp> 249{ 250}; 251 252 253#ifndef _LIBCPP_CXX03_LANG 254// 3 or more arguments 255 256template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 257struct __weak_result_type<_Rp (_A1, _A2, _A3, _A4...)> 258{ 259 typedef _Rp result_type; 260}; 261 262template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 263struct __weak_result_type<_Rp (&)(_A1, _A2, _A3, _A4...)> 264{ 265 typedef _Rp result_type; 266}; 267 268template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 269struct __weak_result_type<_Rp (*)(_A1, _A2, _A3, _A4...)> 270{ 271 typedef _Rp result_type; 272}; 273 274template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 275struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...)> 276{ 277 typedef _Rp result_type; 278}; 279 280template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 281struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const> 282{ 283 typedef _Rp result_type; 284}; 285 286template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 287struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) volatile> 288{ 289 typedef _Rp result_type; 290}; 291 292template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 293struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const volatile> 294{ 295 typedef _Rp result_type; 296}; 297 298template <class _Tp, class ..._Args> 299struct __invoke_return 300{ 301 typedef decltype(__invoke(_VSTD::declval<_Tp>(), _VSTD::declval<_Args>()...)) type; 302}; 303 304#else // defined(_LIBCPP_CXX03_LANG) 305 306#include <__functional_base_03> 307 308#endif // !defined(_LIBCPP_CXX03_LANG) 309 310 311template <class _Ret> 312struct __invoke_void_return_wrapper 313{ 314#ifndef _LIBCPP_CXX03_LANG 315 template <class ..._Args> 316 static _Ret __call(_Args&&... __args) { 317 return __invoke(_VSTD::forward<_Args>(__args)...); 318 } 319#else 320 template <class _Fn> 321 static _Ret __call(_Fn __f) { 322 return __invoke(__f); 323 } 324 325 template <class _Fn, class _A0> 326 static _Ret __call(_Fn __f, _A0& __a0) { 327 return __invoke(__f, __a0); 328 } 329 330 template <class _Fn, class _A0, class _A1> 331 static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1) { 332 return __invoke(__f, __a0, __a1); 333 } 334 335 template <class _Fn, class _A0, class _A1, class _A2> 336 static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2){ 337 return __invoke(__f, __a0, __a1, __a2); 338 } 339#endif 340}; 341 342template <> 343struct __invoke_void_return_wrapper<void> 344{ 345#ifndef _LIBCPP_CXX03_LANG 346 template <class ..._Args> 347 static void __call(_Args&&... __args) { 348 __invoke(_VSTD::forward<_Args>(__args)...); 349 } 350#else 351 template <class _Fn> 352 static void __call(_Fn __f) { 353 __invoke(__f); 354 } 355 356 template <class _Fn, class _A0> 357 static void __call(_Fn __f, _A0& __a0) { 358 __invoke(__f, __a0); 359 } 360 361 template <class _Fn, class _A0, class _A1> 362 static void __call(_Fn __f, _A0& __a0, _A1& __a1) { 363 __invoke(__f, __a0, __a1); 364 } 365 366 template <class _Fn, class _A0, class _A1, class _A2> 367 static void __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2) { 368 __invoke(__f, __a0, __a1, __a2); 369 } 370#endif 371}; 372 373template <class _Tp> 374class _LIBCPP_TEMPLATE_VIS reference_wrapper 375 : public __weak_result_type<_Tp> 376{ 377public: 378 // types 379 typedef _Tp type; 380private: 381 type* __f_; 382 383public: 384 // construct/copy/destroy 385 _LIBCPP_INLINE_VISIBILITY reference_wrapper(type& __f) _NOEXCEPT 386 : __f_(_VSTD::addressof(__f)) {} 387#ifndef _LIBCPP_CXX03_LANG 388 private: reference_wrapper(type&&); public: // = delete; // do not bind to temps 389#endif 390 391 // access 392 _LIBCPP_INLINE_VISIBILITY operator type& () const _NOEXCEPT {return *__f_;} 393 _LIBCPP_INLINE_VISIBILITY type& get() const _NOEXCEPT {return *__f_;} 394 395#ifndef _LIBCPP_CXX03_LANG 396 // invoke 397 template <class... _ArgTypes> 398 _LIBCPP_INLINE_VISIBILITY 399 typename __invoke_of<type&, _ArgTypes...>::type 400 operator() (_ArgTypes&&... __args) const { 401 return __invoke(get(), _VSTD::forward<_ArgTypes>(__args)...); 402 } 403#else 404 405 _LIBCPP_INLINE_VISIBILITY 406 typename __invoke_return<type>::type 407 operator() () const { 408 return __invoke(get()); 409 } 410 411 template <class _A0> 412 _LIBCPP_INLINE_VISIBILITY 413 typename __invoke_return0<type, _A0>::type 414 operator() (_A0& __a0) const { 415 return __invoke(get(), __a0); 416 } 417 418 template <class _A0> 419 _LIBCPP_INLINE_VISIBILITY 420 typename __invoke_return0<type, _A0 const>::type 421 operator() (_A0 const& __a0) const { 422 return __invoke(get(), __a0); 423 } 424 425 template <class _A0, class _A1> 426 _LIBCPP_INLINE_VISIBILITY 427 typename __invoke_return1<type, _A0, _A1>::type 428 operator() (_A0& __a0, _A1& __a1) const { 429 return __invoke(get(), __a0, __a1); 430 } 431 432 template <class _A0, class _A1> 433 _LIBCPP_INLINE_VISIBILITY 434 typename __invoke_return1<type, _A0 const, _A1>::type 435 operator() (_A0 const& __a0, _A1& __a1) const { 436 return __invoke(get(), __a0, __a1); 437 } 438 439 template <class _A0, class _A1> 440 _LIBCPP_INLINE_VISIBILITY 441 typename __invoke_return1<type, _A0, _A1 const>::type 442 operator() (_A0& __a0, _A1 const& __a1) const { 443 return __invoke(get(), __a0, __a1); 444 } 445 446 template <class _A0, class _A1> 447 _LIBCPP_INLINE_VISIBILITY 448 typename __invoke_return1<type, _A0 const, _A1 const>::type 449 operator() (_A0 const& __a0, _A1 const& __a1) const { 450 return __invoke(get(), __a0, __a1); 451 } 452 453 template <class _A0, class _A1, class _A2> 454 _LIBCPP_INLINE_VISIBILITY 455 typename __invoke_return2<type, _A0, _A1, _A2>::type 456 operator() (_A0& __a0, _A1& __a1, _A2& __a2) const { 457 return __invoke(get(), __a0, __a1, __a2); 458 } 459 460 template <class _A0, class _A1, class _A2> 461 _LIBCPP_INLINE_VISIBILITY 462 typename __invoke_return2<type, _A0 const, _A1, _A2>::type 463 operator() (_A0 const& __a0, _A1& __a1, _A2& __a2) const { 464 return __invoke(get(), __a0, __a1, __a2); 465 } 466 467 template <class _A0, class _A1, class _A2> 468 _LIBCPP_INLINE_VISIBILITY 469 typename __invoke_return2<type, _A0, _A1 const, _A2>::type 470 operator() (_A0& __a0, _A1 const& __a1, _A2& __a2) const { 471 return __invoke(get(), __a0, __a1, __a2); 472 } 473 474 template <class _A0, class _A1, class _A2> 475 _LIBCPP_INLINE_VISIBILITY 476 typename __invoke_return2<type, _A0, _A1, _A2 const>::type 477 operator() (_A0& __a0, _A1& __a1, _A2 const& __a2) const { 478 return __invoke(get(), __a0, __a1, __a2); 479 } 480 481 template <class _A0, class _A1, class _A2> 482 _LIBCPP_INLINE_VISIBILITY 483 typename __invoke_return2<type, _A0 const, _A1 const, _A2>::type 484 operator() (_A0 const& __a0, _A1 const& __a1, _A2& __a2) const { 485 return __invoke(get(), __a0, __a1, __a2); 486 } 487 488 template <class _A0, class _A1, class _A2> 489 _LIBCPP_INLINE_VISIBILITY 490 typename __invoke_return2<type, _A0 const, _A1, _A2 const>::type 491 operator() (_A0 const& __a0, _A1& __a1, _A2 const& __a2) const { 492 return __invoke(get(), __a0, __a1, __a2); 493 } 494 495 template <class _A0, class _A1, class _A2> 496 _LIBCPP_INLINE_VISIBILITY 497 typename __invoke_return2<type, _A0, _A1 const, _A2 const>::type 498 operator() (_A0& __a0, _A1 const& __a1, _A2 const& __a2) const { 499 return __invoke(get(), __a0, __a1, __a2); 500 } 501 502 template <class _A0, class _A1, class _A2> 503 _LIBCPP_INLINE_VISIBILITY 504 typename __invoke_return2<type, _A0 const, _A1 const, _A2 const>::type 505 operator() (_A0 const& __a0, _A1 const& __a1, _A2 const& __a2) const { 506 return __invoke(get(), __a0, __a1, __a2); 507 } 508#endif // _LIBCPP_CXX03_LANG 509}; 510 511 512template <class _Tp> 513inline _LIBCPP_INLINE_VISIBILITY 514reference_wrapper<_Tp> 515ref(_Tp& __t) _NOEXCEPT 516{ 517 return reference_wrapper<_Tp>(__t); 518} 519 520template <class _Tp> 521inline _LIBCPP_INLINE_VISIBILITY 522reference_wrapper<_Tp> 523ref(reference_wrapper<_Tp> __t) _NOEXCEPT 524{ 525 return ref(__t.get()); 526} 527 528template <class _Tp> 529inline _LIBCPP_INLINE_VISIBILITY 530reference_wrapper<const _Tp> 531cref(const _Tp& __t) _NOEXCEPT 532{ 533 return reference_wrapper<const _Tp>(__t); 534} 535 536template <class _Tp> 537inline _LIBCPP_INLINE_VISIBILITY 538reference_wrapper<const _Tp> 539cref(reference_wrapper<_Tp> __t) _NOEXCEPT 540{ 541 return cref(__t.get()); 542} 543 544#ifndef _LIBCPP_CXX03_LANG 545template <class _Tp> void ref(const _Tp&&) = delete; 546template <class _Tp> void cref(const _Tp&&) = delete; 547#endif 548 549#if _LIBCPP_STD_VER > 11 550template <class _Tp, class, class = void> 551struct __is_transparent : false_type {}; 552 553template <class _Tp, class _Up> 554struct __is_transparent<_Tp, _Up, 555 typename __void_t<typename _Tp::is_transparent>::type> 556 : true_type {}; 557#endif 558 559// allocator_arg_t 560 561struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; }; 562 563#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY) 564extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg; 565#else 566/* _LIBCPP_INLINE_VAR */ constexpr allocator_arg_t allocator_arg = allocator_arg_t(); 567#endif 568 569// uses_allocator 570 571template <class _Tp> 572struct __has_allocator_type 573{ 574private: 575 struct __two {char __lx; char __lxx;}; 576 template <class _Up> static __two __test(...); 577 template <class _Up> static char __test(typename _Up::allocator_type* = 0); 578public: 579 static const bool value = sizeof(__test<_Tp>(0)) == 1; 580}; 581 582template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value> 583struct __uses_allocator 584 : public integral_constant<bool, 585 is_convertible<_Alloc, typename _Tp::allocator_type>::value> 586{ 587}; 588 589template <class _Tp, class _Alloc> 590struct __uses_allocator<_Tp, _Alloc, false> 591 : public false_type 592{ 593}; 594 595template <class _Tp, class _Alloc> 596struct _LIBCPP_TEMPLATE_VIS uses_allocator 597 : public __uses_allocator<_Tp, _Alloc> 598{ 599}; 600 601#if _LIBCPP_STD_VER > 14 602template <class _Tp, class _Alloc> 603_LIBCPP_INLINE_VAR constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value; 604#endif 605 606#ifndef _LIBCPP_CXX03_LANG 607 608// allocator construction 609 610template <class _Tp, class _Alloc, class ..._Args> 611struct __uses_alloc_ctor_imp 612{ 613 typedef _LIBCPP_NODEBUG_TYPE typename __uncvref<_Alloc>::type _RawAlloc; 614 static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value; 615 static const bool __ic = 616 is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value; 617 static const int value = __ua ? 2 - __ic : 0; 618}; 619 620template <class _Tp, class _Alloc, class ..._Args> 621struct __uses_alloc_ctor 622 : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value> 623 {}; 624 625template <class _Tp, class _Allocator, class... _Args> 626inline _LIBCPP_INLINE_VISIBILITY 627void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args ) 628{ 629 new (__storage) _Tp (_VSTD::forward<_Args>(__args)...); 630} 631 632// FIXME: This should have a version which takes a non-const alloc. 633template <class _Tp, class _Allocator, class... _Args> 634inline _LIBCPP_INLINE_VISIBILITY 635void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args ) 636{ 637 new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...); 638} 639 640// FIXME: This should have a version which takes a non-const alloc. 641template <class _Tp, class _Allocator, class... _Args> 642inline _LIBCPP_INLINE_VISIBILITY 643void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args ) 644{ 645 new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a); 646} 647 648#endif // _LIBCPP_CXX03_LANG 649 650_LIBCPP_END_NAMESPACE_STD 651 652#endif // _LIBCPP_FUNCTIONAL_BASE 653