__tuple revision 234959 
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_VISIBLE tuple_size;
31
32template <class _Tp>
33class _LIBCPP_VISIBLE tuple_size<const _Tp>
34    : public tuple_size<_Tp> {};
35
36template <class _Tp>
37class _LIBCPP_VISIBLE tuple_size<volatile _Tp>
38    : public tuple_size<_Tp> {};
39
40template <class _Tp>
41class _LIBCPP_VISIBLE tuple_size<const volatile _Tp>
42    : public tuple_size<_Tp> {};
43
44template <size_t _Ip, class _Tp> class _LIBCPP_VISIBLE tuple_element;
45
46template <size_t _Ip, class _Tp>
47class _LIBCPP_VISIBLE 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_VISIBLE 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_VISIBLE 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_VISIBLE tuple;
68template <class _T1, class _T2> struct _LIBCPP_VISIBLE pair;
69template <class _Tp, size_t _Size> struct _LIBCPP_VISIBLE 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>
82typename tuple_element<_Ip, tuple<_Tp...> >::type&
83get(tuple<_Tp...>&) _NOEXCEPT;
84
85template <size_t _Ip, class ..._Tp>
86const typename tuple_element<_Ip, tuple<_Tp...> >::type&
87get(const tuple<_Tp...>&) _NOEXCEPT;
88
89template <size_t _Ip, class ..._Tp>
90typename tuple_element<_Ip, tuple<_Tp...> >::type&&
91get(tuple<_Tp...>&&) _NOEXCEPT;
92
93template <size_t _Ip, class _T1, class _T2>
94typename tuple_element<_Ip, pair<_T1, _T2> >::type&
95get(pair<_T1, _T2>&) _NOEXCEPT;
96
97template <size_t _Ip, class _T1, class _T2>
98const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
99get(const pair<_T1, _T2>&) _NOEXCEPT;
100
101template <size_t _Ip, class _T1, class _T2>
102typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
103get(pair<_T1, _T2>&&) _NOEXCEPT;
104
105template <size_t _Ip, class _Tp, size_t _Size>
106_Tp&
107get(array<_Tp, _Size>&) _NOEXCEPT;
108
109template <size_t _Ip, class _Tp, size_t _Size>
110const _Tp&
111get(const array<_Tp, _Size>&) _NOEXCEPT;
112
113template <size_t _Ip, class _Tp, size_t _Size>
114_Tp&&
115get(array<_Tp, _Size>&&) _NOEXCEPT;
116
117// __make_tuple_indices
118
119template <size_t...> struct __tuple_indices {};
120
121template <size_t _Sp, class _IntTuple, size_t _Ep>
122struct __make_indices_imp;
123
124template <size_t _Sp, size_t ..._Indices, size_t _Ep>
125struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
126{
127    typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
128};
129
130template <size_t _Ep, size_t ..._Indices>
131struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
132{
133    typedef __tuple_indices<_Indices...> type;
134};
135
136template <size_t _Ep, size_t _Sp = 0>
137struct __make_tuple_indices
138{
139    static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
140    typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
141};
142
143// __tuple_types
144
145template <class ..._Tp> struct __tuple_types {};
146
147template <size_t _Ip>
148class _LIBCPP_VISIBLE tuple_element<_Ip, __tuple_types<> >
149{
150public:
151    static_assert(_Ip == 0, "tuple_element index out of range");
152    static_assert(_Ip != 0, "tuple_element index out of range");
153};
154
155template <class _Hp, class ..._Tp>
156class _LIBCPP_VISIBLE tuple_element<0, __tuple_types<_Hp, _Tp...> >
157{
158public:
159    typedef _Hp type;
160};
161
162template <size_t _Ip, class _Hp, class ..._Tp>
163class _LIBCPP_VISIBLE tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
164{
165public:
166    typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
167};
168
169template <class ..._Tp>
170class _LIBCPP_VISIBLE tuple_size<__tuple_types<_Tp...> >
171    : public integral_constant<size_t, sizeof...(_Tp)>
172{
173};
174
175template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
176
177// __make_tuple_types
178
179// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
180// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
181// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>.  If _Tuple is a
182// lvalue_reference type, then __tuple_types<_Types&...> is the result.
183
184template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
185struct __make_tuple_types_imp;
186
187template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
188struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
189{
190    typedef typename remove_reference<_Tp>::type _Tpr;
191    typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
192                                            typename conditional<is_lvalue_reference<_Tp>::value,
193                                                typename tuple_element<_Sp, _Tpr>::type&,
194                                                typename tuple_element<_Sp, _Tpr>::type>::type>,
195                                            _Tp, _Sp+1, _Ep>::type type;
196};
197
198template <class ..._Types, class _Tp, size_t _Ep>
199struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
200{
201    typedef __tuple_types<_Types...> type;
202};
203
204template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
205struct __make_tuple_types
206{
207    static_assert(_Sp <= _Ep, "__make_tuple_types input error");
208    typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
209};
210
211// __tuple_convertible
212
213template <bool, class _Tp, class _Up>
214struct __tuple_convertible_imp : public false_type {};
215
216template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
217struct __tuple_convertible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
218    : public integral_constant<bool,
219                               is_convertible<_Tp0, _Up0>::value &&
220                               __tuple_convertible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
221
222template <>
223struct __tuple_convertible_imp<true, __tuple_types<>, __tuple_types<> >
224    : public true_type {};
225
226template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
227                                bool = __tuple_like<_Up>::value>
228struct __tuple_convertible
229    : public false_type {};
230
231template <class _Tp, class _Up>
232struct __tuple_convertible<_Tp, _Up, true, true>
233    : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
234                                     tuple_size<_Up>::value,
235             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
236{};
237
238// __tuple_constructible
239
240template <bool, class _Tp, class _Up>
241struct __tuple_constructible_imp : public false_type {};
242
243template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
244struct __tuple_constructible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
245    : public integral_constant<bool,
246                               is_constructible<_Up0, _Tp0>::value &&
247                               __tuple_constructible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
248
249template <>
250struct __tuple_constructible_imp<true, __tuple_types<>, __tuple_types<> >
251    : public true_type {};
252
253template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
254                                bool = __tuple_like<_Up>::value>
255struct __tuple_constructible
256    : public false_type {};
257
258template <class _Tp, class _Up>
259struct __tuple_constructible<_Tp, _Up, true, true>
260    : public __tuple_constructible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
261                                     tuple_size<_Up>::value,
262             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
263{};
264
265// __tuple_assignable
266
267template <bool, class _Tp, class _Up>
268struct __tuple_assignable_imp : public false_type {};
269
270template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
271struct __tuple_assignable_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
272    : public integral_constant<bool,
273                               is_assignable<_Up0&, _Tp0>::value &&
274                               __tuple_assignable_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
275
276template <>
277struct __tuple_assignable_imp<true, __tuple_types<>, __tuple_types<> >
278    : public true_type {};
279
280template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
281                                bool = __tuple_like<_Up>::value>
282struct __tuple_assignable
283    : public false_type {};
284
285template <class _Tp, class _Up>
286struct __tuple_assignable<_Tp, _Up, true, true>
287    : public __tuple_assignable_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
288                                    tuple_size<_Up>::value,
289             typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
290{};
291
292_LIBCPP_END_NAMESPACE_STD
293
294#endif  // _LIBCPP_HAS_NO_VARIADICS
295
296#endif  // _LIBCPP___TUPLE
297