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1// -*- C++ -*-
2//===---------------------------- stack -----------------------------------===//
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_STACK
12#define _LIBCPP_STACK
13
14/*
15    stack synopsis
16
17namespace std
18{
19
20template <class T, class Container = deque<T>>
21class stack
22{
23public:
24    typedef Container                                container_type;
25    typedef typename container_type::value_type      value_type;
26    typedef typename container_type::reference       reference;
27    typedef typename container_type::const_reference const_reference;
28    typedef typename container_type::size_type       size_type;
29
30protected:
31    container_type c;
32
33public:
34    stack() = default;
35    ~stack() = default;
36
37    stack(const stack& q) = default;
38    stack(stack&& q) = default;
39
40    stack& operator=(const stack& q) = default;
41    stack& operator=(stack&& q) = default;
42
43    explicit stack(const container_type& c);
44    explicit stack(container_type&& c);
45    template <class Alloc> explicit stack(const Alloc& a);
46    template <class Alloc> stack(const container_type& c, const Alloc& a);
47    template <class Alloc> stack(container_type&& c, const Alloc& a);
48    template <class Alloc> stack(const stack& c, const Alloc& a);
49    template <class Alloc> stack(stack&& c, const Alloc& a);
50
51    bool empty() const;
52    size_type size() const;
53    reference top();
54    const_reference top() const;
55
56    void push(const value_type& x);
57    void push(value_type&& x);
58    template <class... Args> reference emplace(Args&&... args); // reference in C++17
59    void pop();
60
61    void swap(stack& c) noexcept(is_nothrow_swappable_v<Container>)
62};
63
64template<class Container>
65  stack(Container) -> stack<typename Container::value_type, Container>;  // C++17
66
67template<class Container, class Allocator>
68  stack(Container, Allocator) -> stack<typename Container::value_type, Container>; // C++17
69
70template <class T, class Container>
71  bool operator==(const stack<T, Container>& x, const stack<T, Container>& y);
72template <class T, class Container>
73  bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
74template <class T, class Container>
75  bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
76template <class T, class Container>
77  bool operator> (const stack<T, Container>& x, const stack<T, Container>& y);
78template <class T, class Container>
79  bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
80template <class T, class Container>
81  bool operator<=(const stack<T, Container>& x, const stack<T, Container>& y);
82
83template <class T, class Container>
84  void swap(stack<T, Container>& x, stack<T, Container>& y)
85  noexcept(noexcept(x.swap(y)));
86
87}  // std
88
89*/
90
91#include <__config>
92#include <deque>
93
94#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
95#pragma GCC system_header
96#endif
97
98_LIBCPP_BEGIN_NAMESPACE_STD
99
100template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TEMPLATE_VIS stack;
101
102template <class _Tp, class _Container>
103_LIBCPP_INLINE_VISIBILITY
104bool
105operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
106
107template <class _Tp, class _Container>
108_LIBCPP_INLINE_VISIBILITY
109bool
110operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
111
112template <class _Tp, class _Container /*= deque<_Tp>*/>
113class _LIBCPP_TEMPLATE_VIS stack
114{
115public:
116    typedef _Container                               container_type;
117    typedef typename container_type::value_type      value_type;
118    typedef typename container_type::reference       reference;
119    typedef typename container_type::const_reference const_reference;
120    typedef typename container_type::size_type       size_type;
121    static_assert((is_same<_Tp, value_type>::value), "" );
122
123protected:
124    container_type c;
125
126public:
127    _LIBCPP_INLINE_VISIBILITY
128    stack()
129        _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value)
130        : c() {}
131
132    _LIBCPP_INLINE_VISIBILITY
133    stack(const stack& __q) : c(__q.c) {}
134
135    _LIBCPP_INLINE_VISIBILITY
136    stack& operator=(const stack& __q) {c = __q.c; return *this;}
137
138
139#ifndef _LIBCPP_CXX03_LANG
140    _LIBCPP_INLINE_VISIBILITY
141    stack(stack&& __q)
142        _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
143        : c(_VSTD::move(__q.c)) {}
144
145    _LIBCPP_INLINE_VISIBILITY
146    stack& operator=(stack&& __q)
147        _NOEXCEPT_(is_nothrow_move_assignable<container_type>::value)
148        {c = _VSTD::move(__q.c); return *this;}
149
150    _LIBCPP_INLINE_VISIBILITY
151    explicit stack(container_type&& __c) : c(_VSTD::move(__c)) {}
152#endif  // _LIBCPP_CXX03_LANG
153
154    _LIBCPP_INLINE_VISIBILITY
155    explicit stack(const container_type& __c) : c(__c) {}
156
157    template <class _Alloc>
158        _LIBCPP_INLINE_VISIBILITY
159        explicit stack(const _Alloc& __a,
160                       typename enable_if<uses_allocator<container_type,
161                                                         _Alloc>::value>::type* = 0)
162            : c(__a) {}
163    template <class _Alloc>
164        _LIBCPP_INLINE_VISIBILITY
165        stack(const container_type& __c, const _Alloc& __a,
166              typename enable_if<uses_allocator<container_type,
167                                                _Alloc>::value>::type* = 0)
168            : c(__c, __a) {}
169    template <class _Alloc>
170        _LIBCPP_INLINE_VISIBILITY
171        stack(const stack& __s, const _Alloc& __a,
172              typename enable_if<uses_allocator<container_type,
173                                                _Alloc>::value>::type* = 0)
174            : c(__s.c, __a) {}
175#ifndef _LIBCPP_CXX03_LANG
176    template <class _Alloc>
177        _LIBCPP_INLINE_VISIBILITY
178        stack(container_type&& __c, const _Alloc& __a,
179              typename enable_if<uses_allocator<container_type,
180                                                _Alloc>::value>::type* = 0)
181            : c(_VSTD::move(__c), __a) {}
182    template <class _Alloc>
183        _LIBCPP_INLINE_VISIBILITY
184        stack(stack&& __s, const _Alloc& __a,
185              typename enable_if<uses_allocator<container_type,
186                                                _Alloc>::value>::type* = 0)
187            : c(_VSTD::move(__s.c), __a) {}
188#endif  // _LIBCPP_CXX03_LANG
189
190    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
191    bool empty()     const      {return c.empty();}
192    _LIBCPP_INLINE_VISIBILITY
193    size_type size() const      {return c.size();}
194    _LIBCPP_INLINE_VISIBILITY
195    reference top()             {return c.back();}
196    _LIBCPP_INLINE_VISIBILITY
197    const_reference top() const {return c.back();}
198
199    _LIBCPP_INLINE_VISIBILITY
200    void push(const value_type& __v) {c.push_back(__v);}
201#ifndef _LIBCPP_CXX03_LANG
202    _LIBCPP_INLINE_VISIBILITY
203    void push(value_type&& __v) {c.push_back(_VSTD::move(__v));}
204
205    template <class... _Args>
206        _LIBCPP_INLINE_VISIBILITY
207#if _LIBCPP_STD_VER > 14
208        decltype(auto) emplace(_Args&&... __args)
209        { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
210#else
211        void      emplace(_Args&&... __args)
212        {        c.emplace_back(_VSTD::forward<_Args>(__args)...);}
213#endif
214#endif  // _LIBCPP_CXX03_LANG
215
216    _LIBCPP_INLINE_VISIBILITY
217    void pop() {c.pop_back();}
218
219    _LIBCPP_INLINE_VISIBILITY
220    void swap(stack& __s)
221        _NOEXCEPT_(__is_nothrow_swappable<container_type>::value)
222    {
223        using _VSTD::swap;
224        swap(c, __s.c);
225    }
226
227    template <class T1, class _C1>
228    friend
229    bool
230    operator==(const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
231
232    template <class T1, class _C1>
233    friend
234    bool
235    operator< (const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
236};
237
238#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
239template<class _Container,
240         class = typename enable_if<!__is_allocator<_Container>::value, nullptr_t>::type
241>
242stack(_Container)
243    -> stack<typename _Container::value_type, _Container>;
244
245template<class _Container,
246         class _Alloc,
247         class = typename enable_if<!__is_allocator<_Container>::value, nullptr_t>::type,
248         class = typename enable_if< __is_allocator<_Alloc>::value, nullptr_t>::type
249         >
250stack(_Container, _Alloc)
251    -> stack<typename _Container::value_type, _Container>;
252#endif
253
254template <class _Tp, class _Container>
255inline _LIBCPP_INLINE_VISIBILITY
256bool
257operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
258{
259    return __x.c == __y.c;
260}
261
262template <class _Tp, class _Container>
263inline _LIBCPP_INLINE_VISIBILITY
264bool
265operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
266{
267    return __x.c < __y.c;
268}
269
270template <class _Tp, class _Container>
271inline _LIBCPP_INLINE_VISIBILITY
272bool
273operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
274{
275    return !(__x == __y);
276}
277
278template <class _Tp, class _Container>
279inline _LIBCPP_INLINE_VISIBILITY
280bool
281operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
282{
283    return __y < __x;
284}
285
286template <class _Tp, class _Container>
287inline _LIBCPP_INLINE_VISIBILITY
288bool
289operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
290{
291    return !(__x < __y);
292}
293
294template <class _Tp, class _Container>
295inline _LIBCPP_INLINE_VISIBILITY
296bool
297operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
298{
299    return !(__y < __x);
300}
301
302template <class _Tp, class _Container>
303inline _LIBCPP_INLINE_VISIBILITY
304typename enable_if<
305    __is_swappable<_Container>::value,
306    void
307>::type
308swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
309    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
310{
311    __x.swap(__y);
312}
313
314template <class _Tp, class _Container, class _Alloc>
315struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
316    : public uses_allocator<_Container, _Alloc>
317{
318};
319
320_LIBCPP_END_NAMESPACE_STD
321
322#endif  // _LIBCPP_STACK
323