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393 lines
12 KiB
393 lines
12 KiB
// Stack implementation -*- C++ -*-
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996,1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/stl_stack.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{stack}
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*/
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#ifndef _STL_STACK_H
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#define _STL_STACK_H 1
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#include <bits/concept_check.h>
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#include <debug/debug.h>
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#if __cplusplus >= 201103L
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# include <bits/uses_allocator.h>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @brief A standard container giving FILO behavior.
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*
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* @ingroup sequences
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*
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* @tparam _Tp Type of element.
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* @tparam _Sequence Type of underlying sequence, defaults to deque<_Tp>.
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*
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* Meets many of the requirements of a
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* <a href="tables.html#65">container</a>,
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* but does not define anything to do with iterators. Very few of the
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* other standard container interfaces are defined.
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*
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* This is not a true container, but an @e adaptor. It holds
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* another container, and provides a wrapper interface to that
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* container. The wrapper is what enforces strict
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* first-in-last-out %stack behavior.
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*
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* The second template parameter defines the type of the underlying
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* sequence/container. It defaults to std::deque, but it can be
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* any type that supports @c back, @c push_back, and @c pop_back,
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* such as std::list, std::vector, or an appropriate user-defined
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* type.
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*
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* Members not found in @a normal containers are @c container_type,
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* which is a typedef for the second Sequence parameter, and @c
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* push, @c pop, and @c top, which are standard %stack/FILO
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* operations.
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*/
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template<typename _Tp, typename _Sequence = deque<_Tp> >
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class stack
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{
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#ifdef _GLIBCXX_CONCEPT_CHECKS
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// concept requirements
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typedef typename _Sequence::value_type _Sequence_value_type;
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# if __cplusplus < 201103L
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__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
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__glibcxx_class_requires(_Sequence, _BackInsertionSequenceConcept)
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# endif
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__glibcxx_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept)
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#endif
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template<typename _Tp1, typename _Seq1>
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friend bool
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operator==(const stack<_Tp1, _Seq1>&, const stack<_Tp1, _Seq1>&);
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template<typename _Tp1, typename _Seq1>
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friend bool
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operator<(const stack<_Tp1, _Seq1>&, const stack<_Tp1, _Seq1>&);
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#if __cpp_lib_three_way_comparison
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template<typename _Tp1, three_way_comparable _Seq1>
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friend compare_three_way_result_t<_Seq1>
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operator<=>(const stack<_Tp1, _Seq1>&, const stack<_Tp1, _Seq1>&);
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#endif
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#if __cplusplus >= 201103L
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template<typename _Alloc>
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using _Uses = typename
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enable_if<uses_allocator<_Sequence, _Alloc>::value>::type;
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#if __cplusplus >= 201703L
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2566. Requirements on the first template parameter of container
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// adaptors
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static_assert(is_same<_Tp, typename _Sequence::value_type>::value,
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"value_type must be the same as the underlying container");
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#endif // C++17
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#endif // C++11
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public:
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typedef typename _Sequence::value_type value_type;
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typedef typename _Sequence::reference reference;
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typedef typename _Sequence::const_reference const_reference;
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typedef typename _Sequence::size_type size_type;
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typedef _Sequence container_type;
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protected:
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// See queue::c for notes on this name.
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_Sequence c;
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public:
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// XXX removed old def ctor, added def arg to this one to match 14882
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/**
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* @brief Default constructor creates no elements.
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*/
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#if __cplusplus < 201103L
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explicit
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stack(const _Sequence& __c = _Sequence())
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: c(__c) { }
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#else
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template<typename _Seq = _Sequence, typename _Requires = typename
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enable_if<is_default_constructible<_Seq>::value>::type>
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stack()
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: c() { }
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explicit
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stack(const _Sequence& __c)
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: c(__c) { }
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explicit
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stack(_Sequence&& __c)
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: c(std::move(__c)) { }
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template<typename _Alloc, typename _Requires = _Uses<_Alloc>>
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explicit
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stack(const _Alloc& __a)
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: c(__a) { }
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template<typename _Alloc, typename _Requires = _Uses<_Alloc>>
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stack(const _Sequence& __c, const _Alloc& __a)
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: c(__c, __a) { }
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template<typename _Alloc, typename _Requires = _Uses<_Alloc>>
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stack(_Sequence&& __c, const _Alloc& __a)
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: c(std::move(__c), __a) { }
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template<typename _Alloc, typename _Requires = _Uses<_Alloc>>
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stack(const stack& __q, const _Alloc& __a)
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: c(__q.c, __a) { }
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template<typename _Alloc, typename _Requires = _Uses<_Alloc>>
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stack(stack&& __q, const _Alloc& __a)
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: c(std::move(__q.c), __a) { }
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#endif
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/**
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* Returns true if the %stack is empty.
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*/
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_GLIBCXX_NODISCARD bool
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empty() const
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{ return c.empty(); }
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/** Returns the number of elements in the %stack. */
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size_type
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size() const
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{ return c.size(); }
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/**
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* Returns a read/write reference to the data at the first
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* element of the %stack.
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*/
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reference
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top()
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{
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__glibcxx_requires_nonempty();
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return c.back();
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}
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/**
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* Returns a read-only (constant) reference to the data at the first
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* element of the %stack.
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*/
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const_reference
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top() const
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{
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__glibcxx_requires_nonempty();
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return c.back();
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}
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/**
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* @brief Add data to the top of the %stack.
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* @param __x Data to be added.
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*
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* This is a typical %stack operation. The function creates an
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* element at the top of the %stack and assigns the given data
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* to it. The time complexity of the operation depends on the
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* underlying sequence.
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*/
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void
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push(const value_type& __x)
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{ c.push_back(__x); }
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#if __cplusplus >= 201103L
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void
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push(value_type&& __x)
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{ c.push_back(std::move(__x)); }
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#if __cplusplus > 201402L
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template<typename... _Args>
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decltype(auto)
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emplace(_Args&&... __args)
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{ return c.emplace_back(std::forward<_Args>(__args)...); }
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#else
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template<typename... _Args>
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void
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emplace(_Args&&... __args)
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{ c.emplace_back(std::forward<_Args>(__args)...); }
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#endif
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#endif
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/**
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* @brief Removes first element.
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*
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* This is a typical %stack operation. It shrinks the %stack
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* by one. The time complexity of the operation depends on the
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* underlying sequence.
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*
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* Note that no data is returned, and if the first element's
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* data is needed, it should be retrieved before pop() is
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* called.
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*/
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void
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pop()
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{
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__glibcxx_requires_nonempty();
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c.pop_back();
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}
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#if __cplusplus >= 201103L
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void
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swap(stack& __s)
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#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
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noexcept(__is_nothrow_swappable<_Sequence>::value)
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#else
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noexcept(__is_nothrow_swappable<_Tp>::value)
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#endif
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{
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using std::swap;
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swap(c, __s.c);
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}
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#endif // __cplusplus >= 201103L
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};
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#if __cpp_deduction_guides >= 201606
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template<typename _Container,
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typename = _RequireNotAllocator<_Container>>
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stack(_Container) -> stack<typename _Container::value_type, _Container>;
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template<typename _Container, typename _Allocator,
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typename = _RequireNotAllocator<_Container>,
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typename = _RequireAllocator<_Allocator>>
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stack(_Container, _Allocator)
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-> stack<typename _Container::value_type, _Container>;
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#endif
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/**
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* @brief Stack equality comparison.
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* @param __x A %stack.
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* @param __y A %stack of the same type as @a __x.
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* @return True iff the size and elements of the stacks are equal.
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*
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* This is an equivalence relation. Complexity and semantics
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* depend on the underlying sequence type, but the expected rules
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* are: this relation is linear in the size of the sequences, and
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* stacks are considered equivalent if their sequences compare
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* equal.
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*/
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template<typename _Tp, typename _Seq>
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inline bool
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operator==(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return __x.c == __y.c; }
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/**
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* @brief Stack ordering relation.
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* @param __x A %stack.
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* @param __y A %stack of the same type as @a x.
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* @return True iff @a x is lexicographically less than @a __y.
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*
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* This is an total ordering relation. Complexity and semantics
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* depend on the underlying sequence type, but the expected rules
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* are: this relation is linear in the size of the sequences, the
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* elements must be comparable with @c <, and
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* std::lexicographical_compare() is usually used to make the
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* determination.
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*/
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template<typename _Tp, typename _Seq>
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inline bool
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operator<(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return __x.c < __y.c; }
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/// Based on operator==
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template<typename _Tp, typename _Seq>
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inline bool
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operator!=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return !(__x == __y); }
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/// Based on operator<
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template<typename _Tp, typename _Seq>
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inline bool
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operator>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return __y < __x; }
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/// Based on operator<
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template<typename _Tp, typename _Seq>
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inline bool
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operator<=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return !(__y < __x); }
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/// Based on operator<
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template<typename _Tp, typename _Seq>
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inline bool
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operator>=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return !(__x < __y); }
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#if __cpp_lib_three_way_comparison
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template<typename _Tp, three_way_comparable _Seq>
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inline compare_three_way_result_t<_Seq>
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operator<=>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
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{ return __x.c <=> __y.c; }
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#endif
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#if __cplusplus >= 201103L
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template<typename _Tp, typename _Seq>
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inline
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#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
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// Constrained free swap overload, see p0185r1
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typename enable_if<__is_swappable<_Seq>::value>::type
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#else
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void
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#endif
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swap(stack<_Tp, _Seq>& __x, stack<_Tp, _Seq>& __y)
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noexcept(noexcept(__x.swap(__y)))
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{ __x.swap(__y); }
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template<typename _Tp, typename _Seq, typename _Alloc>
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struct uses_allocator<stack<_Tp, _Seq>, _Alloc>
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: public uses_allocator<_Seq, _Alloc>::type { };
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#endif // __cplusplus >= 201103L
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif /* _STL_STACK_H */
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