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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 T, class Container>
     65   bool operator==(const stack<T, Container>& x, const stack<T, Container>& y);
     66 template <class T, class Container>
     67   bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
     68 template <class T, class Container>
     69   bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
     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 
     77 template <class T, class Container>
     78   void swap(stack<T, Container>& x, stack<T, Container>& y)
     79   noexcept(noexcept(x.swap(y)));
     80 
     81 }  // std
     82 
     83 */
     84 
     85 #include <__config>
     86 #include <deque>
     87 
     88 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
     89 #pragma GCC system_header
     90 #endif
     91 
     92 _LIBCPP_BEGIN_NAMESPACE_STD
     93 
     94 template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TEMPLATE_VIS stack;
     95 
     96 template <class _Tp, class _Container>
     97 _LIBCPP_INLINE_VISIBILITY
     98 bool
     99 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
    100 
    101 template <class _Tp, class _Container>
    102 _LIBCPP_INLINE_VISIBILITY
    103 bool
    104 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
    105 
    106 template <class _Tp, class _Container /*= deque<_Tp>*/>
    107 class _LIBCPP_TEMPLATE_VIS stack
    108 {
    109 public:
    110     typedef _Container                               container_type;
    111     typedef typename container_type::value_type      value_type;
    112     typedef typename container_type::reference       reference;
    113     typedef typename container_type::const_reference const_reference;
    114     typedef typename container_type::size_type       size_type;
    115     static_assert((is_same<_Tp, value_type>::value), "" );
    116     
    117 protected:
    118     container_type c;
    119 
    120 public:
    121     _LIBCPP_INLINE_VISIBILITY
    122     stack()
    123         _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value)
    124         : c() {}
    125 
    126     _LIBCPP_INLINE_VISIBILITY
    127     stack(const stack& __q) : c(__q.c) {}
    128 
    129     _LIBCPP_INLINE_VISIBILITY
    130     stack& operator=(const stack& __q) {c = __q.c; return *this;}
    131 
    132 
    133 #ifndef _LIBCPP_CXX03_LANG
    134     _LIBCPP_INLINE_VISIBILITY
    135     stack(stack&& __q)
    136         _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
    137         : c(_VSTD::move(__q.c)) {}
    138 
    139     _LIBCPP_INLINE_VISIBILITY
    140     stack& operator=(stack&& __q)
    141         _NOEXCEPT_(is_nothrow_move_assignable<container_type>::value)
    142         {c = _VSTD::move(__q.c); return *this;}
    143 
    144     _LIBCPP_INLINE_VISIBILITY
    145     explicit stack(container_type&& __c) : c(_VSTD::move(__c)) {}
    146 #endif  // _LIBCPP_CXX03_LANG
    147 
    148     _LIBCPP_INLINE_VISIBILITY
    149     explicit stack(const container_type& __c) : c(__c) {}
    150 
    151     template <class _Alloc>
    152         _LIBCPP_INLINE_VISIBILITY
    153         explicit stack(const _Alloc& __a,
    154                        typename enable_if<uses_allocator<container_type,
    155                                                          _Alloc>::value>::type* = 0)
    156             : c(__a) {}
    157     template <class _Alloc>
    158         _LIBCPP_INLINE_VISIBILITY
    159         stack(const container_type& __c, const _Alloc& __a,
    160               typename enable_if<uses_allocator<container_type,
    161                                                 _Alloc>::value>::type* = 0)
    162             : c(__c, __a) {}
    163     template <class _Alloc>
    164         _LIBCPP_INLINE_VISIBILITY
    165         stack(const stack& __s, const _Alloc& __a,
    166               typename enable_if<uses_allocator<container_type,
    167                                                 _Alloc>::value>::type* = 0)
    168             : c(__s.c, __a) {}
    169 #ifndef _LIBCPP_CXX03_LANG
    170     template <class _Alloc>
    171         _LIBCPP_INLINE_VISIBILITY
    172         stack(container_type&& __c, const _Alloc& __a,
    173               typename enable_if<uses_allocator<container_type,
    174                                                 _Alloc>::value>::type* = 0)
    175             : c(_VSTD::move(__c), __a) {}
    176     template <class _Alloc>
    177         _LIBCPP_INLINE_VISIBILITY
    178         stack(stack&& __s, const _Alloc& __a,
    179               typename enable_if<uses_allocator<container_type,
    180                                                 _Alloc>::value>::type* = 0)
    181             : c(_VSTD::move(__s.c), __a) {}
    182 #endif  // _LIBCPP_CXX03_LANG
    183 
    184     _LIBCPP_INLINE_VISIBILITY
    185     bool empty()     const      {return c.empty();}
    186     _LIBCPP_INLINE_VISIBILITY
    187     size_type size() const      {return c.size();}
    188     _LIBCPP_INLINE_VISIBILITY
    189     reference top()             {return c.back();}
    190     _LIBCPP_INLINE_VISIBILITY
    191     const_reference top() const {return c.back();}
    192 
    193     _LIBCPP_INLINE_VISIBILITY
    194     void push(const value_type& __v) {c.push_back(__v);}
    195 #ifndef _LIBCPP_CXX03_LANG
    196     _LIBCPP_INLINE_VISIBILITY
    197     void push(value_type&& __v) {c.push_back(_VSTD::move(__v));}
    198 
    199     template <class... _Args>
    200         _LIBCPP_INLINE_VISIBILITY
    201 #if _LIBCPP_STD_VER > 14
    202         reference emplace(_Args&&... __args)
    203         { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
    204 #else
    205         void      emplace(_Args&&... __args)
    206         {        c.emplace_back(_VSTD::forward<_Args>(__args)...);}
    207 #endif
    208 #endif  // _LIBCPP_CXX03_LANG
    209 
    210     _LIBCPP_INLINE_VISIBILITY
    211     void pop() {c.pop_back();}
    212 
    213     _LIBCPP_INLINE_VISIBILITY
    214     void swap(stack& __s)
    215         _NOEXCEPT_(__is_nothrow_swappable<container_type>::value)
    216     {
    217         using _VSTD::swap;
    218         swap(c, __s.c);
    219     }
    220 
    221     template <class T1, class _C1>
    222     friend
    223     bool
    224     operator==(const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
    225 
    226     template <class T1, class _C1>
    227     friend
    228     bool
    229     operator< (const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
    230 };
    231 
    232 template <class _Tp, class _Container>
    233 inline _LIBCPP_INLINE_VISIBILITY
    234 bool
    235 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    236 {
    237     return __x.c == __y.c;
    238 }
    239 
    240 template <class _Tp, class _Container>
    241 inline _LIBCPP_INLINE_VISIBILITY
    242 bool
    243 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    244 {
    245     return __x.c < __y.c;
    246 }
    247 
    248 template <class _Tp, class _Container>
    249 inline _LIBCPP_INLINE_VISIBILITY
    250 bool
    251 operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    252 {
    253     return !(__x == __y);
    254 }
    255 
    256 template <class _Tp, class _Container>
    257 inline _LIBCPP_INLINE_VISIBILITY
    258 bool
    259 operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    260 {
    261     return __y < __x;
    262 }
    263 
    264 template <class _Tp, class _Container>
    265 inline _LIBCPP_INLINE_VISIBILITY
    266 bool
    267 operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    268 {
    269     return !(__x < __y);
    270 }
    271 
    272 template <class _Tp, class _Container>
    273 inline _LIBCPP_INLINE_VISIBILITY
    274 bool
    275 operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    276 {
    277     return !(__y < __x);
    278 }
    279 
    280 template <class _Tp, class _Container>
    281 inline _LIBCPP_INLINE_VISIBILITY
    282 typename enable_if<
    283     __is_swappable<_Container>::value,
    284     void
    285 >::type
    286 swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
    287     _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
    288 {
    289     __x.swap(__y);
    290 }
    291 
    292 template <class _Tp, class _Container, class _Alloc>
    293 struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
    294     : public uses_allocator<_Container, _Alloc>
    295 {
    296 };
    297 
    298 _LIBCPP_END_NAMESPACE_STD
    299 
    300 #endif  // _LIBCPP_STACK
    301