__tuple revision 262801 
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
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___TUPLE
12#define _LIBCPP___TUPLE
13
14#include <__config>
15#include <cstddef>
16#include <type_traits>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#pragma GCC system_header
20#endif
21
22#ifdef _LIBCPP_HAS_NO_VARIADICS
23
24#include <__tuple_03>
25
26#else  // _LIBCPP_HAS_NO_VARIADICS
27
28_LIBCPP_BEGIN_NAMESPACE_STD
29
30template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
31
32template <class _Tp>
33class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
34    : public tuple_size<_Tp> {};
35
36template <class _Tp>
37class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
38    : public tuple_size<_Tp> {};
39
40template <class _Tp>
41class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
42    : public tuple_size<_Tp> {};
43
44template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
45
46template <size_t _Ip, class _Tp>
47class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
48{
49public:
50    typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
51};
52
53template <size_t _Ip, class _Tp>
54class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
55{
56public:
57    typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
58};
59
60template <size_t _Ip, class _Tp>
61class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
62{
63public:
64    typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
65};
66
67template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
68template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
69template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
70
71template <class _Tp> struct __tuple_like : false_type {};
72
73template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
74template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
75template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
76
77template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
78template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
79template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
80
81template <size_t _Ip, class ..._Tp>
82_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
83typename tuple_element<_Ip, tuple<_Tp...> >::type&
84get(tuple<_Tp...>&) _NOEXCEPT;
85
86template <size_t _Ip, class ..._Tp>
87_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
88const typename tuple_element<_Ip, tuple<_Tp...> >::type&
89get(const tuple<_Tp...>&) _NOEXCEPT;
90
91template <size_t _Ip, class ..._Tp>
92_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
93typename tuple_element<_Ip, tuple<_Tp...> >::type&&
94get(tuple<_Tp...>&&) _NOEXCEPT;
95
96template <size_t _Ip, class _T1, class _T2>
97_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
98typename tuple_element<_Ip, pair<_T1, _T2> >::type&
99get(pair<_T1, _T2>&) _NOEXCEPT;
100
101template <size_t _Ip, class _T1, class _T2>
102_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
103const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
104get(const pair<_T1, _T2>&) _NOEXCEPT;
105
106template <size_t _Ip, class _T1, class _T2>
107_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
108typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
109get(pair<_T1, _T2>&&) _NOEXCEPT;
110
111template <size_t _Ip, class _Tp, size_t _Size>
112_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
113_Tp&
114get(array<_Tp, _Size>&) _NOEXCEPT;
115
116template <size_t _Ip, class _Tp, size_t _Size>
117_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
118const _Tp&
119get(const array<_Tp, _Size>&) _NOEXCEPT;
120
121template <size_t _Ip, class _Tp, size_t _Size>
122_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
123_Tp&&
124get(array<_Tp, _Size>&&) _NOEXCEPT;
125
126// __make_tuple_indices
127
128template <size_t...> struct __tuple_indices {};
129
130template <size_t _Sp, class _IntTuple, size_t _Ep>
131struct __make_indices_imp;
132
133template <size_t _Sp, size_t ..._Indices, size_t _Ep>
134struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
135{
136    typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
137};
138
139template <size_t _Ep, size_t ..._Indices>
140struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
141{
142    typedef __tuple_indices<_Indices...> type;
143};
144
145template <size_t _Ep, size_t _Sp = 0>
146struct __make_tuple_indices
147{
148    static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
149    typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
150};
151
152// __tuple_types
153
154template <class ..._Tp> struct __tuple_types {};
155
156template <size_t _Ip>
157class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
158{
159public:
160    static_assert(_Ip == 0, "tuple_element index out of range");
161    static_assert(_Ip != 0, "tuple_element index out of range");
162};
163
164template <class _Hp, class ..._Tp>
165class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
166{
167public:
168    typedef _Hp type;
169};
170
171template <size_t _Ip, class _Hp, class ..._Tp>
172class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
173{
174public:
175    typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
176};
177
178template <class ..._Tp>
179class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
180    : public integral_constant<size_t, sizeof...(_Tp)>
181{
182};
183
184template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
185
186// __make_tuple_types
187
188// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
189// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
190// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>.  If _Tuple is a
191// lvalue_reference type, then __tuple_types<_Types&...> is the result.
192
193template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
194struct __make_tuple_types_imp;
195
196template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
197struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
198{
199    typedef typename remove_reference<_Tp>::type _Tpr;
200    typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
201                                            typename conditional<is_lvalue_reference<_Tp>::value,
202                                                typename tuple_element<_Sp, _Tpr>::type&,
203                                                typename tuple_element<_Sp, _Tpr>::type>::type>,
204                                            _Tp, _Sp+1, _Ep>::type type;
205};
206
207template <class ..._Types, class _Tp, size_t _Ep>
208struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
209{
210    typedef __tuple_types<_Types...> type;
211};
212
213template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
214struct __make_tuple_types
215{
216    static_assert(_Sp <= _Ep, "__make_tuple_types input error");
217    typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
218};
219
220// __tuple_convertible
221
222template <bool, class _Tp, class _Up>
223struct __tuple_convertible_imp : public false_type {};
224
225template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
226struct __tuple_convertible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
227    : public integral_constant<bool,
228                               is_convertible<_Tp0, _Up0>::value &&
229                               __tuple_convertible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
230
231template <>
232struct __tuple_convertible_imp<true, __tuple_types<>, __tuple_types<> >
233    : public true_type {};
234
235template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
236                                bool = __tuple_like<_Up>::value>
237struct __tuple_convertible
238    : public false_type {};
239
240template <class _Tp, class _Up>
241struct __tuple_convertible<_Tp, _Up, true, true>
242    : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
243                                     tuple_size<_Up>::value,
244             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
245{};
246
247// __tuple_constructible
248
249template <bool, class _Tp, class _Up>
250struct __tuple_constructible_imp : public false_type {};
251
252template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
253struct __tuple_constructible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
254    : public integral_constant<bool,
255                               is_constructible<_Up0, _Tp0>::value &&
256                               __tuple_constructible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
257
258template <>
259struct __tuple_constructible_imp<true, __tuple_types<>, __tuple_types<> >
260    : public true_type {};
261
262template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
263                                bool = __tuple_like<_Up>::value>
264struct __tuple_constructible
265    : public false_type {};
266
267template <class _Tp, class _Up>
268struct __tuple_constructible<_Tp, _Up, true, true>
269    : public __tuple_constructible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
270                                     tuple_size<_Up>::value,
271             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
272{};
273
274// __tuple_assignable
275
276template <bool, class _Tp, class _Up>
277struct __tuple_assignable_imp : public false_type {};
278
279template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
280struct __tuple_assignable_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
281    : public integral_constant<bool,
282                               is_assignable<_Up0&, _Tp0>::value &&
283                               __tuple_assignable_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
284
285template <>
286struct __tuple_assignable_imp<true, __tuple_types<>, __tuple_types<> >
287    : public true_type {};
288
289template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
290                                bool = __tuple_like<_Up>::value>
291struct __tuple_assignable
292    : public false_type {};
293
294template <class _Tp, class _Up>
295struct __tuple_assignable<_Tp, _Up, true, true>
296    : public __tuple_assignable_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
297                                    tuple_size<_Up>::value,
298             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
299{};
300
301_LIBCPP_END_NAMESPACE_STD
302
303#endif  // _LIBCPP_HAS_NO_VARIADICS
304
305#endif  // _LIBCPP___TUPLE
306