xref: /freebsd/contrib/llvm-project/libcxx/include/stack (revision 8312a902f98c8a1d991bcee86acbff2abc218d58) 
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_STACK
11#define _LIBCPP_STACK
12
13/*
14    stack synopsis
15
16namespace std
17{
18
19template <class T, class Container = deque<T>>
20class stack
21{
22public:
23    typedef Container                                container_type;
24    typedef typename container_type::value_type      value_type;
25    typedef typename container_type::reference       reference;
26    typedef typename container_type::const_reference const_reference;
27    typedef typename container_type::size_type       size_type;
28
29protected:
30    container_type c;
31
32public:
33    stack() = default;
34    ~stack() = default;
35
36    stack(const stack& q) = default;
37    stack(stack&& q) = default;
38
39    stack& operator=(const stack& q) = default;
40    stack& operator=(stack&& q) = default;
41
42    explicit stack(const container_type& c);
43    explicit stack(container_type&& c);
44    template <class InputIterator> stack(InputIterator first, InputIterator last); // since C++23
45    template<container-compatible-range<T> R> stack(from_range_t, R&& rg); // since C++23
46    template <class Alloc> explicit stack(const Alloc& a);
47    template <class Alloc> stack(const container_type& c, const Alloc& a);
48    template <class Alloc> stack(container_type&& c, const Alloc& a);
49    template <class Alloc> stack(const stack& c, const Alloc& a);
50    template <class Alloc> stack(stack&& c, const Alloc& a);
51    template<class InputIterator, class Alloc>
52    stack(InputIterator first, InputIterator last, const Alloc&); // since C++23
53    template<container-compatible-range<T> R, class Alloc>
54      stack(from_range_t, R&& rg, const Alloc&); // since C++23
55
56    bool empty() const;
57    size_type size() const;
58    reference top();
59    const_reference top() const;
60
61    void push(const value_type& x);
62    void push(value_type&& x);
63    template<container-compatible-range<T> R>
64      void push_range(R&& rg); // C++23
65    template <class... Args> reference emplace(Args&&... args); // reference in C++17
66    void pop();
67
68    void swap(stack& c) noexcept(is_nothrow_swappable_v<Container>)
69};
70
71template<class Container>
72  stack(Container) -> stack<typename Container::value_type, Container>;  // C++17
73
74template<class InputIterator>
75  stack(InputIterator, InputIterator) -> stack<iter-value-type<InputIterator>>; // since C++23
76
77template<ranges::input_range R>
78  stack(from_range_t, R&&) -> stack<ranges::range_value_t<R>>; // since C++23
79
80template<class Container, class Allocator>
81  stack(Container, Allocator) -> stack<typename Container::value_type, Container>; // C++17
82
83template<class InputIterator, class Allocator>
84  stack(InputIterator, InputIterator, Allocator)
85    -> stack<iter-value-type<InputIterator>,
86             deque<iter-value-type<InputIterator>, Allocator>>; // since C++23
87
88template<ranges::input_range R, class Allocator>
89  stack(from_range_t, R&&, Allocator)
90    -> stack<ranges::range_value_t<R>, deque<ranges::range_value_t<R>, Allocator>>; // since C++23
91
92template <class T, class Container>
93  bool operator==(const stack<T, Container>& x, const stack<T, Container>& y);
94template <class T, class Container>
95  bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
96template <class T, class Container>
97  bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
98template <class T, class Container>
99  bool operator> (const stack<T, Container>& x, const stack<T, Container>& y);
100template <class T, class Container>
101  bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
102template <class T, class Container>
103  bool operator<=(const stack<T, Container>& x, const stack<T, Container>& y);
104template<class T, three_way_comparable Container>
105  compare_three_way_result_t<Container>
106    operator<=>(const stack<T, Container>& x, const stack<T, Container>& y); // since C++20
107
108template <class T, class Container>
109  void swap(stack<T, Container>& x, stack<T, Container>& y)
110  noexcept(noexcept(x.swap(y)));
111
112}  // std
113
114*/
115
116#include <__algorithm/ranges_copy.h>
117#include <__assert> // all public C++ headers provide the assertion handler
118#include <__config>
119#include <__iterator/back_insert_iterator.h>
120#include <__iterator/iterator_traits.h>
121#include <__memory/uses_allocator.h>
122#include <__ranges/access.h>
123#include <__ranges/concepts.h>
124#include <__ranges/container_compatible_range.h>
125#include <__ranges/from_range.h>
126#include <__type_traits/is_same.h>
127#include <__utility/forward.h>
128#include <deque>
129#include <version>
130
131// standard-mandated includes
132
133// [stack.syn]
134#include <compare>
135#include <initializer_list>
136
137#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
138#  pragma GCC system_header
139#endif
140
141_LIBCPP_BEGIN_NAMESPACE_STD
142
143template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TEMPLATE_VIS stack;
144
145template <class _Tp, class _Container>
146_LIBCPP_INLINE_VISIBILITY
147bool
148operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
149
150template <class _Tp, class _Container>
151_LIBCPP_INLINE_VISIBILITY
152bool
153operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
154
155template <class _Tp, class _Container /*= deque<_Tp>*/>
156class _LIBCPP_TEMPLATE_VIS stack
157{
158public:
159    typedef _Container                               container_type;
160    typedef typename container_type::value_type      value_type;
161    typedef typename container_type::reference       reference;
162    typedef typename container_type::const_reference const_reference;
163    typedef typename container_type::size_type       size_type;
164    static_assert((is_same<_Tp, value_type>::value), "" );
165
166protected:
167    container_type c;
168
169public:
170    _LIBCPP_INLINE_VISIBILITY
171    stack()
172        _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value)
173        : c() {}
174
175    _LIBCPP_INLINE_VISIBILITY
176    stack(const stack& __q) : c(__q.c) {}
177
178    _LIBCPP_INLINE_VISIBILITY
179    stack& operator=(const stack& __q) {c = __q.c; return *this;}
180
181
182#ifndef _LIBCPP_CXX03_LANG
183    _LIBCPP_INLINE_VISIBILITY
184    stack(stack&& __q)
185        _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
186        : c(_VSTD::move(__q.c)) {}
187
188    _LIBCPP_INLINE_VISIBILITY
189    stack& operator=(stack&& __q)
190        _NOEXCEPT_(is_nothrow_move_assignable<container_type>::value)
191        {c = _VSTD::move(__q.c); return *this;}
192
193    _LIBCPP_INLINE_VISIBILITY
194    explicit stack(container_type&& __c) : c(_VSTD::move(__c)) {}
195#endif // _LIBCPP_CXX03_LANG
196
197    _LIBCPP_INLINE_VISIBILITY
198    explicit stack(const container_type& __c) : c(__c) {}
199
200    template <class _Alloc>
201        _LIBCPP_INLINE_VISIBILITY
202        explicit stack(const _Alloc& __a,
203                       __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
204            : c(__a) {}
205    template <class _Alloc>
206        _LIBCPP_INLINE_VISIBILITY
207        stack(const container_type& __c, const _Alloc& __a,
208              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
209            : c(__c, __a) {}
210    template <class _Alloc>
211        _LIBCPP_INLINE_VISIBILITY
212        stack(const stack& __s, const _Alloc& __a,
213              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
214            : c(__s.c, __a) {}
215#ifndef _LIBCPP_CXX03_LANG
216    template <class _Alloc>
217        _LIBCPP_INLINE_VISIBILITY
218        stack(container_type&& __c, const _Alloc& __a,
219              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
220            : c(_VSTD::move(__c), __a) {}
221    template <class _Alloc>
222        _LIBCPP_INLINE_VISIBILITY
223        stack(stack&& __s, const _Alloc& __a,
224              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
225            : c(_VSTD::move(__s.c), __a) {}
226#endif // _LIBCPP_CXX03_LANG
227
228#if _LIBCPP_STD_VER >= 23
229    template <class _InputIterator,
230              class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
231    _LIBCPP_HIDE_FROM_ABI
232    stack(_InputIterator __first, _InputIterator __last) : c(__first, __last) {}
233
234    template <_ContainerCompatibleRange<_Tp> _Range>
235    _LIBCPP_HIDE_FROM_ABI
236    stack(from_range_t, _Range&& __range) : c(from_range, std::forward<_Range>(__range)) {}
237
238    template <class _InputIterator,
239              class _Alloc,
240              class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
241              class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
242    _LIBCPP_HIDE_FROM_ABI
243    stack(_InputIterator __first, _InputIterator __last, const _Alloc& __alloc) : c(__first, __last, __alloc) {}
244
245    template <_ContainerCompatibleRange<_Tp> _Range,
246              class _Alloc,
247              class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
248    _LIBCPP_HIDE_FROM_ABI
249    stack(from_range_t, _Range&& __range, const _Alloc& __alloc)
250        : c(from_range, std::forward<_Range>(__range), __alloc) {}
251
252#endif
253
254    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
255    bool empty()     const      {return c.empty();}
256    _LIBCPP_INLINE_VISIBILITY
257    size_type size() const      {return c.size();}
258    _LIBCPP_INLINE_VISIBILITY
259    reference top()             {return c.back();}
260    _LIBCPP_INLINE_VISIBILITY
261    const_reference top() const {return c.back();}
262
263    _LIBCPP_INLINE_VISIBILITY
264    void push(const value_type& __v) {c.push_back(__v);}
265#ifndef _LIBCPP_CXX03_LANG
266    _LIBCPP_INLINE_VISIBILITY
267    void push(value_type&& __v) {c.push_back(_VSTD::move(__v));}
268
269#if _LIBCPP_STD_VER >= 23
270    template <_ContainerCompatibleRange<_Tp> _Range>
271    _LIBCPP_HIDE_FROM_ABI
272    void push_range(_Range&& __range) {
273      if constexpr (requires (container_type& __c) {
274        __c.append_range(std::forward<_Range>(__range));
275      }) {
276        c.append_range(std::forward<_Range>(__range));
277      } else {
278        ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
279      }
280    }
281#endif
282
283    template <class... _Args>
284        _LIBCPP_INLINE_VISIBILITY
285#if _LIBCPP_STD_VER >= 17
286        decltype(auto) emplace(_Args&&... __args)
287        { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
288#else
289        void      emplace(_Args&&... __args)
290        {        c.emplace_back(_VSTD::forward<_Args>(__args)...);}
291#endif
292#endif // _LIBCPP_CXX03_LANG
293
294    _LIBCPP_INLINE_VISIBILITY
295    void pop() {c.pop_back();}
296
297    _LIBCPP_INLINE_VISIBILITY
298    void swap(stack& __s)
299        _NOEXCEPT_(__is_nothrow_swappable<container_type>::value)
300    {
301        using _VSTD::swap;
302        swap(c, __s.c);
303    }
304
305    _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }
306
307    template <class _T1, class _OtherContainer>
308    friend
309    bool
310    operator==(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
311
312    template <class _T1, class _OtherContainer>
313    friend
314    bool
315    operator< (const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
316};
317
318#if _LIBCPP_STD_VER >= 17
319template<class _Container,
320         class = enable_if_t<!__is_allocator<_Container>::value>
321>
322stack(_Container)
323    -> stack<typename _Container::value_type, _Container>;
324
325template<class _Container,
326         class _Alloc,
327         class = enable_if_t<!__is_allocator<_Container>::value>,
328         class = enable_if_t<uses_allocator<_Container, _Alloc>::value>
329         >
330stack(_Container, _Alloc)
331    -> stack<typename _Container::value_type, _Container>;
332#endif
333
334#if _LIBCPP_STD_VER >= 23
335template<class _InputIterator,
336         class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
337stack(_InputIterator, _InputIterator)
338    -> stack<__iter_value_type<_InputIterator>>;
339
340template <ranges::input_range _Range>
341stack(from_range_t, _Range&&) -> stack<ranges::range_value_t<_Range>>;
342
343template<class _InputIterator,
344         class _Alloc,
345         class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
346         class = __enable_if_t<__is_allocator<_Alloc>::value>>
347stack(_InputIterator, _InputIterator, _Alloc)
348    -> stack<__iter_value_type<_InputIterator>, deque<__iter_value_type<_InputIterator>, _Alloc>>;
349
350template <ranges::input_range _Range,
351          class _Alloc,
352          class = __enable_if_t<__is_allocator<_Alloc>::value>>
353stack(from_range_t, _Range&&, _Alloc)
354  -> stack<ranges::range_value_t<_Range>, deque<ranges::range_value_t<_Range>, _Alloc>>;
355
356#endif
357
358template <class _Tp, class _Container>
359inline _LIBCPP_INLINE_VISIBILITY
360bool
361operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
362{
363    return __x.c == __y.c;
364}
365
366template <class _Tp, class _Container>
367inline _LIBCPP_INLINE_VISIBILITY
368bool
369operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
370{
371    return __x.c < __y.c;
372}
373
374template <class _Tp, class _Container>
375inline _LIBCPP_INLINE_VISIBILITY
376bool
377operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
378{
379    return !(__x == __y);
380}
381
382template <class _Tp, class _Container>
383inline _LIBCPP_INLINE_VISIBILITY
384bool
385operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
386{
387    return __y < __x;
388}
389
390template <class _Tp, class _Container>
391inline _LIBCPP_INLINE_VISIBILITY
392bool
393operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
394{
395    return !(__x < __y);
396}
397
398template <class _Tp, class _Container>
399inline _LIBCPP_INLINE_VISIBILITY
400bool
401operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
402{
403    return !(__y < __x);
404}
405
406#if _LIBCPP_STD_VER >= 20
407
408template <class _Tp, three_way_comparable _Container>
409_LIBCPP_HIDE_FROM_ABI compare_three_way_result_t<_Container>
410operator<=>(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
411    // clang 16 bug: declaring `friend operator<=>` causes "use of overloaded operator '*' is ambiguous" errors
412    return __x.__get_container() <=> __y.__get_container();
413}
414
415#endif
416
417template <class _Tp, class _Container>
418inline _LIBCPP_INLINE_VISIBILITY
419__enable_if_t<__is_swappable<_Container>::value, void>
420swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
421    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
422{
423    __x.swap(__y);
424}
425
426template <class _Tp, class _Container, class _Alloc>
427struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
428    : public uses_allocator<_Container, _Alloc>
429{
430};
431
432_LIBCPP_END_NAMESPACE_STD
433
434#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
435#  include <concepts>
436#  include <functional>
437#  include <type_traits>
438#endif
439
440#endif // _LIBCPP_STACK
441