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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 
     17 namespace std
     18 {
     19 
     20 template <class T, class Container = deque<T>>
     21 class stack
     22 {
     23 public:
     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 
     30 protected:
     31     container_type c;
     32 
     33 public:
     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 
     64 template<class Container>
     65   stack(Container) -> stack<typename Container::value_type, Container>;  // C++17
     66   
     67 template<class Container, class Allocator> 
     68   stack(Container, Allocator) -> stack<typename Container::value_type, Container>; // C++17
     69 
     70 template <class T, class Container>
     71   bool operator==(const stack<T, Container>& x, const stack<T, Container>& y);
     72 template <class T, class Container>
     73   bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
     74 template <class T, class Container>
     75   bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
     76 template <class T, class Container>
     77   bool operator> (const stack<T, Container>& x, const stack<T, Container>& y);
     78 template <class T, class Container>
     79   bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
     80 template <class T, class Container>
     81   bool operator<=(const stack<T, Container>& x, const stack<T, Container>& y);
     82 
     83 template <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 
    100 template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TEMPLATE_VIS stack;
    101 
    102 template <class _Tp, class _Container>
    103 _LIBCPP_INLINE_VISIBILITY
    104 bool
    105 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
    106 
    107 template <class _Tp, class _Container>
    108 _LIBCPP_INLINE_VISIBILITY
    109 bool
    110 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
    111 
    112 template <class _Tp, class _Container /*= deque<_Tp>*/>
    113 class _LIBCPP_TEMPLATE_VIS stack
    114 {
    115 public:
    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     
    123 protected:
    124     container_type c;
    125 
    126 public:
    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
    239 template<class _Container,
    240          class = typename enable_if<!__is_allocator<_Container>::value, nullptr_t>::type
    241 >
    242 stack(_Container)
    243     -> stack<typename _Container::value_type, _Container>;
    244   
    245 template<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          > 
    250 stack(_Container, _Alloc)
    251     -> stack<typename _Container::value_type, _Container>;
    252 #endif
    253 
    254 template <class _Tp, class _Container>
    255 inline _LIBCPP_INLINE_VISIBILITY
    256 bool
    257 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    258 {
    259     return __x.c == __y.c;
    260 }
    261 
    262 template <class _Tp, class _Container>
    263 inline _LIBCPP_INLINE_VISIBILITY
    264 bool
    265 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    266 {
    267     return __x.c < __y.c;
    268 }
    269 
    270 template <class _Tp, class _Container>
    271 inline _LIBCPP_INLINE_VISIBILITY
    272 bool
    273 operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    274 {
    275     return !(__x == __y);
    276 }
    277 
    278 template <class _Tp, class _Container>
    279 inline _LIBCPP_INLINE_VISIBILITY
    280 bool
    281 operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    282 {
    283     return __y < __x;
    284 }
    285 
    286 template <class _Tp, class _Container>
    287 inline _LIBCPP_INLINE_VISIBILITY
    288 bool
    289 operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    290 {
    291     return !(__x < __y);
    292 }
    293 
    294 template <class _Tp, class _Container>
    295 inline _LIBCPP_INLINE_VISIBILITY
    296 bool
    297 operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    298 {
    299     return !(__y < __x);
    300 }
    301 
    302 template <class _Tp, class _Container>
    303 inline _LIBCPP_INLINE_VISIBILITY
    304 typename enable_if<
    305     __is_swappable<_Container>::value,
    306     void
    307 >::type
    308 swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
    309     _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
    310 {
    311     __x.swap(__y);
    312 }
    313 
    314 template <class _Tp, class _Container, class _Alloc>
    315 struct _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