stack

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_STACK
#define _LIBCPP_STACK

/*
    stack synopsis

namespace std
{

template <class T, class Container = deque<T>>
class stack
{
public:
    typedef Container                                container_type;
    typedef typename container_type::value_type      value_type;
    typedef typename container_type::reference       reference;
    typedef typename container_type::const_reference const_reference;
    typedef typename container_type::size_type       size_type;

protected:
    container_type c;

public:
    stack() = default;
    ~stack() = default;

    stack(const stack& q) = default;
    stack(stack&& q) = default;

    stack& operator=(const stack& q) = default;
    stack& operator=(stack&& q) = default;

    explicit stack(const container_type& c);
    explicit stack(container_type&& c);
    template <class InputIterator> stack(InputIterator first, InputIterator last); // since C++23
    template<container-compatible-range<T> R> stack(from_range_t, R&& rg); // since C++23
    template <class Alloc> explicit stack(const Alloc& a);
    template <class Alloc> stack(const container_type& c, const Alloc& a);
    template <class Alloc> stack(container_type&& c, const Alloc& a);
    template <class Alloc> stack(const stack& c, const Alloc& a);
    template <class Alloc> stack(stack&& c, const Alloc& a);
    template<class InputIterator, class Alloc>
    stack(InputIterator first, InputIterator last, const Alloc&); // since C++23
    template<container-compatible-range<T> R, class Alloc>
      stack(from_range_t, R&& rg, const Alloc&); // since C++23

    bool empty() const;
    size_type size() const;
    reference top();
    const_reference top() const;

    void push(const value_type& x);
    void push(value_type&& x);
    template<container-compatible-range<T> R>
      void push_range(R&& rg); // C++23
    template <class... Args> reference emplace(Args&&... args); // reference in C++17
    void pop();

    void swap(stack& c) noexcept(is_nothrow_swappable_v<Container>)
};

template<class Container>
  stack(Container) -> stack<typename Container::value_type, Container>;  // C++17

template<class InputIterator>
  stack(InputIterator, InputIterator) -> stack<iter-value-type<InputIterator>>; // since C++23

template<ranges::input_range R>
  stack(from_range_t, R&&) -> stack<ranges::range_value_t<R>>; // since C++23

template<class Container, class Allocator>
  stack(Container, Allocator) -> stack<typename Container::value_type, Container>; // C++17

template<class InputIterator, class Allocator>
  stack(InputIterator, InputIterator, Allocator)
    -> stack<iter-value-type<InputIterator>,
             deque<iter-value-type<InputIterator>, Allocator>>; // since C++23

template<ranges::input_range R, class Allocator>
  stack(from_range_t, R&&, Allocator)
    -> stack<ranges::range_value_t<R>, deque<ranges::range_value_t<R>, Allocator>>; // since C++23

template <class T, class Container>
  bool operator==(const stack<T, Container>& x, const stack<T, Container>& y);
template <class T, class Container>
  bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
template <class T, class Container>
  bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
template <class T, class Container>
  bool operator> (const stack<T, Container>& x, const stack<T, Container>& y);
template <class T, class Container>
  bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
template <class T, class Container>
  bool operator<=(const stack<T, Container>& x, const stack<T, Container>& y);
template<class T, three_way_comparable Container>
  compare_three_way_result_t<Container>
    operator<=>(const stack<T, Container>& x, const stack<T, Container>& y); // since C++20

template <class T, class Container>
  void swap(stack<T, Container>& x, stack<T, Container>& y)
  noexcept(noexcept(x.swap(y)));

}  // std

*/

#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#  include <__cxx03/stack>
#else
#  include <__algorithm/ranges_copy.h>
#  include <__config>
#  include <__fwd/stack.h>
#  include <__iterator/back_insert_iterator.h>
#  include <__iterator/iterator_traits.h>
#  include <__memory/uses_allocator.h>
#  include <__ranges/access.h>
#  include <__ranges/concepts.h>
#  include <__ranges/container_compatible_range.h>
#  include <__ranges/from_range.h>
#  include <__type_traits/is_same.h>
#  include <__utility/forward.h>
#  include <deque>
#  include <version>

// standard-mandated includes

// [stack.syn]
#  include <compare>
#  include <initializer_list>

#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#    pragma GCC system_header
#  endif

_LIBCPP_PUSH_MACROS
#  include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, class _Container>
_LIBCPP_HIDE_FROM_ABI bool operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);

template <class _Tp, class _Container>
_LIBCPP_HIDE_FROM_ABI bool operator<(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);

template <class _Tp, class _Container /*= deque<_Tp>*/>
class _LIBCPP_TEMPLATE_VIS stack {
public:
  typedef _Container container_type;
  typedef typename container_type::value_type value_type;
  typedef typename container_type::reference reference;
  typedef typename container_type::const_reference const_reference;
  typedef typename container_type::size_type size_type;
  static_assert(is_same<_Tp, value_type>::value, "");

protected:
  container_type c;

public:
  _LIBCPP_HIDE_FROM_ABI stack() _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value) : c() {}

  _LIBCPP_HIDE_FROM_ABI stack(const stack& __q) : c(__q.c) {}

  _LIBCPP_HIDE_FROM_ABI stack& operator=(const stack& __q) {
    c = __q.c;
    return *this;
  }

#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI stack(stack&& __q) noexcept(is_nothrow_move_constructible<container_type>::value)
      : c(std::move(__q.c)) {}

  _LIBCPP_HIDE_FROM_ABI stack& operator=(stack&& __q) noexcept(is_nothrow_move_assignable<container_type>::value) {
    c = std::move(__q.c);
    return *this;
  }

  _LIBCPP_HIDE_FROM_ABI explicit stack(container_type&& __c) : c(std::move(__c)) {}
#  endif // _LIBCPP_CXX03_LANG

  _LIBCPP_HIDE_FROM_ABI explicit stack(const container_type& __c) : c(__c) {}

  template <class _Alloc>
  _LIBCPP_HIDE_FROM_ABI explicit stack(const _Alloc& __a,
                                       __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
      : c(__a) {}
  template <class _Alloc>
  _LIBCPP_HIDE_FROM_ABI
  stack(const container_type& __c, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
      : c(__c, __a) {}
  template <class _Alloc>
  _LIBCPP_HIDE_FROM_ABI
  stack(const stack& __s, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
      : c(__s.c, __a) {}
#  ifndef _LIBCPP_CXX03_LANG
  template <class _Alloc>
  _LIBCPP_HIDE_FROM_ABI
  stack(container_type&& __c, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
      : c(std::move(__c), __a) {}
  template <class _Alloc>
  _LIBCPP_HIDE_FROM_ABI
  stack(stack&& __s, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
      : c(std::move(__s.c), __a) {}
#  endif // _LIBCPP_CXX03_LANG

#  if _LIBCPP_STD_VER >= 23
  template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI stack(_InputIterator __first, _InputIterator __last) : c(__first, __last) {}

  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI stack(from_range_t, _Range&& __range) : c(from_range, std::forward<_Range>(__range)) {}

  template <class _InputIterator,
            class _Alloc,
            __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0,
            __enable_if_t<uses_allocator<container_type, _Alloc>::value, int>        = 0>
  _LIBCPP_HIDE_FROM_ABI stack(_InputIterator __first, _InputIterator __last, const _Alloc& __alloc)
      : c(__first, __last, __alloc) {}

  template <_ContainerCompatibleRange<_Tp> _Range,
            class _Alloc,
            __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI stack(from_range_t, _Range&& __range, const _Alloc& __alloc)
      : c(from_range, std::forward<_Range>(__range), __alloc) {}

#  endif

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool empty() const { return c.empty(); }
  _LIBCPP_HIDE_FROM_ABI size_type size() const { return c.size(); }
  _LIBCPP_HIDE_FROM_ABI reference top() { return c.back(); }
  _LIBCPP_HIDE_FROM_ABI const_reference top() const { return c.back(); }

  _LIBCPP_HIDE_FROM_ABI void push(const value_type& __v) { c.push_back(__v); }
#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI void push(value_type&& __v) { c.push_back(std::move(__v)); }

#    if _LIBCPP_STD_VER >= 23
  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI void push_range(_Range&& __range) {
    if constexpr (requires(container_type& __c) { __c.append_range(std::forward<_Range>(__range)); }) {
      c.append_range(std::forward<_Range>(__range));
    } else {
      ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
    }
  }
#    endif

  template <class... _Args>
  _LIBCPP_HIDE_FROM_ABI
#    if _LIBCPP_STD_VER >= 17
  decltype(auto)
  emplace(_Args&&... __args) {
    return c.emplace_back(std::forward<_Args>(__args)...);
  }
#    else
  void
  emplace(_Args&&... __args) {
    c.emplace_back(std::forward<_Args>(__args)...);
  }
#    endif
#  endif // _LIBCPP_CXX03_LANG

  _LIBCPP_HIDE_FROM_ABI void pop() { c.pop_back(); }

  _LIBCPP_HIDE_FROM_ABI void swap(stack& __s) _NOEXCEPT_(__is_nothrow_swappable_v<container_type>) {
    using std::swap;
    swap(c, __s.c);
  }

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }

  template <class _T1, class _OtherContainer>
  friend bool operator==(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);

  template <class _T1, class _OtherContainer>
  friend bool operator<(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
};

#  if _LIBCPP_STD_VER >= 17
template <class _Container, class = enable_if_t<!__is_allocator<_Container>::value> >
stack(_Container) -> stack<typename _Container::value_type, _Container>;

template <class _Container,
          class _Alloc,
          class = enable_if_t<!__is_allocator<_Container>::value>,
          class = enable_if_t<uses_allocator<_Container, _Alloc>::value> >
stack(_Container, _Alloc) -> stack<typename _Container::value_type, _Container>;
#  endif

#  if _LIBCPP_STD_VER >= 23
template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
stack(_InputIterator, _InputIterator) -> stack<__iter_value_type<_InputIterator>>;

template <ranges::input_range _Range>
stack(from_range_t, _Range&&) -> stack<ranges::range_value_t<_Range>>;

template <class _InputIterator,
          class _Alloc,
          __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0,
          __enable_if_t<__is_allocator<_Alloc>::value, int>                        = 0>
stack(_InputIterator,
      _InputIterator,
      _Alloc) -> stack<__iter_value_type<_InputIterator>, deque<__iter_value_type<_InputIterator>, _Alloc>>;

template <ranges::input_range _Range, class _Alloc, __enable_if_t<__is_allocator<_Alloc>::value, int> = 0>
stack(from_range_t,
      _Range&&,
      _Alloc) -> stack<ranges::range_value_t<_Range>, deque<ranges::range_value_t<_Range>, _Alloc>>;

#  endif

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return __x.c == __y.c;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator<(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return __x.c < __y.c;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return !(__x == __y);
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator>(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return __y < __x;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return !(__x < __y);
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  return !(__y < __x);
}

#  if _LIBCPP_STD_VER >= 20

template <class _Tp, three_way_comparable _Container>
_LIBCPP_HIDE_FROM_ABI compare_three_way_result_t<_Container>
operator<=>(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
  // clang 16 bug: declaring `friend operator<=>` causes "use of overloaded operator '*' is ambiguous" errors
  return __x.__get_container() <=> __y.__get_container();
}

#  endif

template <class _Tp, class _Container, __enable_if_t<__is_swappable_v<_Container>, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) {
  __x.swap(__y);
}

template <class _Tp, class _Container, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc> : public uses_allocator<_Container, _Alloc> {
};

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
#    include <concepts>
#    include <functional>
#    include <type_traits>
#  endif
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)

#endif // _LIBCPP_STACK