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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> void emplace(Args&&... args);
     59     void pop();
     60 
     61     void swap(stack& c) noexcept(noexcept(swap(c, q.c)));
     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> class _LIBCPP_TYPE_VIS_ONLY 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_TYPE_VIS_ONLY 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 
    116 protected:
    117     container_type c;
    118 
    119 public:
    120     _LIBCPP_INLINE_VISIBILITY
    121     stack()
    122         _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value)
    123         : c() {}
    124 
    125     _LIBCPP_INLINE_VISIBILITY
    126     stack(const stack& __q) : c(__q.c) {}
    127 
    128 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    129     _LIBCPP_INLINE_VISIBILITY
    130     stack(stack&& __q)
    131         _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
    132         : c(_VSTD::move(__q.c)) {}
    133 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    134 
    135     _LIBCPP_INLINE_VISIBILITY
    136     stack& operator=(const stack& __q) {c = __q.c; return *this;}
    137 
    138 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    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 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    144 
    145     _LIBCPP_INLINE_VISIBILITY
    146     explicit stack(const container_type& __c) : c(__c) {}
    147 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    148     _LIBCPP_INLINE_VISIBILITY
    149     explicit stack(container_type&& __c) : c(_VSTD::move(__c)) {}
    150 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    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_HAS_NO_RVALUE_REFERENCES
    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_HAS_NO_RVALUE_REFERENCES
    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_HAS_NO_RVALUE_REFERENCES
    196     _LIBCPP_INLINE_VISIBILITY
    197     void push(value_type&& __v) {c.push_back(_VSTD::move(__v));}
    198 #ifndef _LIBCPP_HAS_NO_VARIADICS
    199     template <class... _Args>
    200         _LIBCPP_INLINE_VISIBILITY
    201         void emplace(_Args&&... __args)
    202         {c.emplace_back(_VSTD::forward<_Args>(__args)...);}
    203 #endif  // _LIBCPP_HAS_NO_VARIADICS
    204 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    205     _LIBCPP_INLINE_VISIBILITY
    206     void pop() {c.pop_back();}
    207 
    208     _LIBCPP_INLINE_VISIBILITY
    209     void swap(stack& __s)
    210         _NOEXCEPT_(__is_nothrow_swappable<container_type>::value)
    211     {
    212         using _VSTD::swap;
    213         swap(c, __s.c);
    214     }
    215 
    216     template <class T1, class _C1>
    217     friend
    218     bool
    219     operator==(const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
    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 
    227 template <class _Tp, class _Container>
    228 inline _LIBCPP_INLINE_VISIBILITY
    229 bool
    230 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    231 {
    232     return __x.c == __y.c;
    233 }
    234 
    235 template <class _Tp, class _Container>
    236 inline _LIBCPP_INLINE_VISIBILITY
    237 bool
    238 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    239 {
    240     return __x.c < __y.c;
    241 }
    242 
    243 template <class _Tp, class _Container>
    244 inline _LIBCPP_INLINE_VISIBILITY
    245 bool
    246 operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    247 {
    248     return !(__x == __y);
    249 }
    250 
    251 template <class _Tp, class _Container>
    252 inline _LIBCPP_INLINE_VISIBILITY
    253 bool
    254 operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    255 {
    256     return __y < __x;
    257 }
    258 
    259 template <class _Tp, class _Container>
    260 inline _LIBCPP_INLINE_VISIBILITY
    261 bool
    262 operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    263 {
    264     return !(__x < __y);
    265 }
    266 
    267 template <class _Tp, class _Container>
    268 inline _LIBCPP_INLINE_VISIBILITY
    269 bool
    270 operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
    271 {
    272     return !(__y < __x);
    273 }
    274 
    275 template <class _Tp, class _Container>
    276 inline _LIBCPP_INLINE_VISIBILITY
    277 void
    278 swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
    279     _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
    280 {
    281     __x.swap(__y);
    282 }
    283 
    284 template <class _Tp, class _Container, class _Alloc>
    285 struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<stack<_Tp, _Container>, _Alloc>
    286     : public uses_allocator<_Container, _Alloc>
    287 {
    288 };
    289 
    290 _LIBCPP_END_NAMESPACE_STD
    291 
    292 #endif  // _LIBCPP_STACK
    293