698 lines
24 KiB
C++
698 lines
24 KiB
C++
// Multiset implementation -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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// 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
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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 stl_multiset.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _STL_MULTISET_H
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#define _STL_MULTISET_H 1
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#include <bits/concept_check.h>
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#include <initializer_list>
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_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_D)
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/**
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* @brief A standard container made up of elements, which can be retrieved
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* in logarithmic time.
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*
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* @ingroup associative_containers
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*
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* Meets the requirements of a <a href="tables.html#65">container</a>, a
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* <a href="tables.html#66">reversible container</a>, and an
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* <a href="tables.html#69">associative container</a> (using equivalent
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* keys). For a @c multiset<Key> the key_type and value_type are Key.
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*
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* Multisets support bidirectional iterators.
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*
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* The private tree data is declared exactly the same way for set and
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* multiset; the distinction is made entirely in how the tree functions are
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* called (*_unique versus *_equal, same as the standard).
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*/
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template <typename _Key, typename _Compare = std::less<_Key>,
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typename _Alloc = std::allocator<_Key> >
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class multiset
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{
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// concept requirements
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typedef typename _Alloc::value_type _Alloc_value_type;
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__glibcxx_class_requires(_Key, _SGIAssignableConcept)
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__glibcxx_class_requires4(_Compare, bool, _Key, _Key,
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_BinaryFunctionConcept)
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__glibcxx_class_requires2(_Key, _Alloc_value_type, _SameTypeConcept)
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public:
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// typedefs:
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typedef _Key key_type;
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typedef _Key value_type;
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typedef _Compare key_compare;
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typedef _Compare value_compare;
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typedef _Alloc allocator_type;
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private:
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/// This turns a red-black tree into a [multi]set.
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typedef typename _Alloc::template rebind<_Key>::other _Key_alloc_type;
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typedef _Rb_tree<key_type, value_type, _Identity<value_type>,
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key_compare, _Key_alloc_type> _Rep_type;
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/// The actual tree structure.
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_Rep_type _M_t;
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public:
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typedef typename _Key_alloc_type::pointer pointer;
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typedef typename _Key_alloc_type::const_pointer const_pointer;
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typedef typename _Key_alloc_type::reference reference;
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typedef typename _Key_alloc_type::const_reference const_reference;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 103. set::iterator is required to be modifiable,
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// but this allows modification of keys.
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typedef typename _Rep_type::const_iterator iterator;
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typedef typename _Rep_type::const_iterator const_iterator;
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typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
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typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
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typedef typename _Rep_type::size_type size_type;
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typedef typename _Rep_type::difference_type difference_type;
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// allocation/deallocation
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/**
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* @brief Default constructor creates no elements.
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*/
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multiset()
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: _M_t() { }
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/**
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* @brief Creates a %multiset with no elements.
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* @param comp Comparator to use.
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* @param a An allocator object.
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*/
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explicit
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multiset(const _Compare& __comp,
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const allocator_type& __a = allocator_type())
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: _M_t(__comp, __a) { }
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/**
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* @brief Builds a %multiset from a range.
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* @param first An input iterator.
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* @param last An input iterator.
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*
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* Create a %multiset consisting of copies of the elements from
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* [first,last). This is linear in N if the range is already sorted,
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* and NlogN otherwise (where N is distance(first,last)).
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*/
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template<typename _InputIterator>
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multiset(_InputIterator __first, _InputIterator __last)
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: _M_t()
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{ _M_t._M_insert_equal(__first, __last); }
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/**
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* @brief Builds a %multiset from a range.
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* @param first An input iterator.
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* @param last An input iterator.
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* @param comp A comparison functor.
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* @param a An allocator object.
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*
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* Create a %multiset consisting of copies of the elements from
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* [first,last). This is linear in N if the range is already sorted,
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* and NlogN otherwise (where N is distance(first,last)).
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*/
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template<typename _InputIterator>
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multiset(_InputIterator __first, _InputIterator __last,
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const _Compare& __comp,
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const allocator_type& __a = allocator_type())
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: _M_t(__comp, __a)
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{ _M_t._M_insert_equal(__first, __last); }
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/**
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* @brief %Multiset copy constructor.
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* @param x A %multiset of identical element and allocator types.
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*
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* The newly-created %multiset uses a copy of the allocation object used
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* by @a x.
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*/
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multiset(const multiset& __x)
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: _M_t(__x._M_t) { }
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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/**
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* @brief %Multiset move constructor.
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* @param x A %multiset of identical element and allocator types.
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*
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* The newly-created %multiset contains the exact contents of @a x.
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* The contents of @a x are a valid, but unspecified %multiset.
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*/
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multiset(multiset&& __x)
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: _M_t(std::forward<_Rep_type>(__x._M_t)) { }
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/**
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* @brief Builds a %multiset from an initializer_list.
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* @param l An initializer_list.
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* @param comp A comparison functor.
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* @param a An allocator object.
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*
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* Create a %multiset consisting of copies of the elements from
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* the list. This is linear in N if the list is already sorted,
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* and NlogN otherwise (where N is @a l.size()).
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*/
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multiset(initializer_list<value_type> __l,
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const _Compare& __comp = _Compare(),
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const allocator_type& __a = allocator_type())
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: _M_t(__comp, __a)
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{ _M_t._M_insert_equal(__l.begin(), __l.end()); }
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#endif
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/**
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* @brief %Multiset assignment operator.
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* @param x A %multiset of identical element and allocator types.
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*
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* All the elements of @a x are copied, but unlike the copy constructor,
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* the allocator object is not copied.
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*/
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multiset&
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operator=(const multiset& __x)
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{
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_M_t = __x._M_t;
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return *this;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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/**
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* @brief %Multiset move assignment operator.
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* @param x A %multiset of identical element and allocator types.
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*
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* The contents of @a x are moved into this %multiset (without copying).
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* @a x is a valid, but unspecified %multiset.
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*/
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multiset&
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operator=(multiset&& __x)
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{
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// NB: DR 675.
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this->clear();
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this->swap(__x);
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return *this;
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}
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/**
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* @brief %Multiset list assignment operator.
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* @param l An initializer_list.
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*
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* This function fills a %multiset with copies of the elements in the
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* initializer list @a l.
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*
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* Note that the assignment completely changes the %multiset and
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* that the resulting %multiset's size is the same as the number
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* of elements assigned. Old data may be lost.
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*/
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multiset&
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operator=(initializer_list<value_type> __l)
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{
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this->clear();
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this->insert(__l.begin(), __l.end());
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return *this;
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}
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#endif
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// accessors:
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/// Returns the comparison object.
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key_compare
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key_comp() const
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{ return _M_t.key_comp(); }
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/// Returns the comparison object.
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value_compare
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value_comp() const
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{ return _M_t.key_comp(); }
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/// Returns the memory allocation object.
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allocator_type
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get_allocator() const
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{ return _M_t.get_allocator(); }
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/**
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* Returns a read-only (constant) iterator that points to the first
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* element in the %multiset. Iteration is done in ascending order
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* according to the keys.
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*/
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iterator
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begin() const
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{ return _M_t.begin(); }
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/**
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* Returns a read-only (constant) iterator that points one past the last
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* element in the %multiset. Iteration is done in ascending order
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* according to the keys.
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*/
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iterator
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end() const
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{ return _M_t.end(); }
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/**
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* Returns a read-only (constant) reverse iterator that points to the
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* last element in the %multiset. Iteration is done in descending order
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* according to the keys.
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*/
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reverse_iterator
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rbegin() const
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{ return _M_t.rbegin(); }
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/**
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* Returns a read-only (constant) reverse iterator that points to the
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* last element in the %multiset. Iteration is done in descending order
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* according to the keys.
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*/
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reverse_iterator
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rend() const
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{ return _M_t.rend(); }
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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/**
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* Returns a read-only (constant) iterator that points to the first
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* element in the %multiset. Iteration is done in ascending order
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* according to the keys.
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*/
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iterator
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cbegin() const
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{ return _M_t.begin(); }
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/**
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* Returns a read-only (constant) iterator that points one past the last
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* element in the %multiset. Iteration is done in ascending order
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* according to the keys.
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*/
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iterator
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cend() const
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{ return _M_t.end(); }
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/**
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* Returns a read-only (constant) reverse iterator that points to the
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* last element in the %multiset. Iteration is done in descending order
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* according to the keys.
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*/
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reverse_iterator
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crbegin() const
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{ return _M_t.rbegin(); }
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/**
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* Returns a read-only (constant) reverse iterator that points to the
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* last element in the %multiset. Iteration is done in descending order
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* according to the keys.
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*/
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reverse_iterator
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crend() const
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{ return _M_t.rend(); }
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#endif
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/// Returns true if the %set is empty.
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bool
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empty() const
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{ return _M_t.empty(); }
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/// Returns the size of the %set.
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size_type
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size() const
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{ return _M_t.size(); }
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/// Returns the maximum size of the %set.
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size_type
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max_size() const
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{ return _M_t.max_size(); }
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/**
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* @brief Swaps data with another %multiset.
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* @param x A %multiset of the same element and allocator types.
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*
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* This exchanges the elements between two multisets in constant time.
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* (It is only swapping a pointer, an integer, and an instance of the @c
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* Compare type (which itself is often stateless and empty), so it should
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* be quite fast.)
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* Note that the global std::swap() function is specialized such that
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* std::swap(s1,s2) will feed to this function.
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*/
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void
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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swap(multiset&& __x)
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#else
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swap(multiset& __x)
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#endif
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{ _M_t.swap(__x._M_t); }
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// insert/erase
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/**
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* @brief Inserts an element into the %multiset.
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* @param x Element to be inserted.
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* @return An iterator that points to the inserted element.
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*
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* This function inserts an element into the %multiset. Contrary
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* to a std::set the %multiset does not rely on unique keys and thus
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* multiple copies of the same element can be inserted.
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*
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* Insertion requires logarithmic time.
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*/
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iterator
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insert(const value_type& __x)
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{ return _M_t._M_insert_equal(__x); }
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/**
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* @brief Inserts an element into the %multiset.
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* @param position An iterator that serves as a hint as to where the
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* element should be inserted.
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* @param x Element to be inserted.
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* @return An iterator that points to the inserted element.
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*
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* This function inserts an element into the %multiset. Contrary
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* to a std::set the %multiset does not rely on unique keys and thus
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* multiple copies of the same element can be inserted.
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*
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* Note that the first parameter is only a hint and can potentially
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* improve the performance of the insertion process. A bad hint would
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* cause no gains in efficiency.
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*
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* See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
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* for more on "hinting".
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*
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* Insertion requires logarithmic time (if the hint is not taken).
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*/
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iterator
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insert(iterator __position, const value_type& __x)
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{ return _M_t._M_insert_equal_(__position, __x); }
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/**
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* @brief A template function that attempts to insert a range of elements.
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* @param first Iterator pointing to the start of the range to be
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* inserted.
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* @param last Iterator pointing to the end of the range.
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*
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* Complexity similar to that of the range constructor.
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*/
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template<typename _InputIterator>
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void
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insert(_InputIterator __first, _InputIterator __last)
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{ _M_t._M_insert_equal(__first, __last); }
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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/**
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* @brief Attempts to insert a list of elements into the %multiset.
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* @param list A std::initializer_list<value_type> of elements
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* to be inserted.
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*
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* Complexity similar to that of the range constructor.
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*/
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void
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insert(initializer_list<value_type> __l)
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{ this->insert(__l.begin(), __l.end()); }
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#endif
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/**
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* @brief Erases an element from a %multiset.
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* @param position An iterator pointing to the element to be erased.
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*
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* This function erases an element, pointed to by the given iterator,
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* from a %multiset. Note that this function only erases the element,
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* and that if the element is itself a pointer, the pointed-to memory is
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* not touched in any way. Managing the pointer is the user's
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* responsibility.
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*/
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void
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erase(iterator __position)
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{ _M_t.erase(__position); }
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/**
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* @brief Erases elements according to the provided key.
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* @param x Key of element to be erased.
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* @return The number of elements erased.
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*
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* This function erases all elements located by the given key from a
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* %multiset.
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* Note that this function only erases the element, and that if
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* the element is itself a pointer, the pointed-to memory is not touched
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* in any way. Managing the pointer is the user's responsibility.
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*/
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size_type
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erase(const key_type& __x)
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{ return _M_t.erase(__x); }
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/**
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* @brief Erases a [first,last) range of elements from a %multiset.
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* @param first Iterator pointing to the start of the range to be
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* erased.
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* @param last Iterator pointing to the end of the range to be erased.
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*
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* This function erases a sequence of elements from a %multiset.
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* Note that this function only erases the elements, and that if
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* the elements themselves are pointers, the pointed-to memory is not
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* touched in any way. Managing the pointer is the user's responsibility.
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*/
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void
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erase(iterator __first, iterator __last)
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{ _M_t.erase(__first, __last); }
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/**
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* Erases all elements in a %multiset. Note that this function only
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* erases the elements, and that if the elements themselves are pointers,
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* the pointed-to memory is not touched in any way. Managing the pointer
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* is the user's responsibility.
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*/
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void
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clear()
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{ _M_t.clear(); }
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// multiset operations:
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/**
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* @brief Finds the number of elements with given key.
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* @param x Key of elements to be located.
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* @return Number of elements with specified key.
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*/
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size_type
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count(const key_type& __x) const
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{ return _M_t.count(__x); }
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 214. set::find() missing const overload
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//@{
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/**
|
|
* @brief Tries to locate an element in a %set.
|
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* @param x Element to be located.
|
|
* @return Iterator pointing to sought-after element, or end() if not
|
|
* found.
|
|
*
|
|
* This function takes a key and tries to locate the element with which
|
|
* the key matches. If successful the function returns an iterator
|
|
* pointing to the sought after element. If unsuccessful it returns the
|
|
* past-the-end ( @c end() ) iterator.
|
|
*/
|
|
iterator
|
|
find(const key_type& __x)
|
|
{ return _M_t.find(__x); }
|
|
|
|
const_iterator
|
|
find(const key_type& __x) const
|
|
{ return _M_t.find(__x); }
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Finds the beginning of a subsequence matching given key.
|
|
* @param x Key to be located.
|
|
* @return Iterator pointing to first element equal to or greater
|
|
* than key, or end().
|
|
*
|
|
* This function returns the first element of a subsequence of elements
|
|
* that matches the given key. If unsuccessful it returns an iterator
|
|
* pointing to the first element that has a greater value than given key
|
|
* or end() if no such element exists.
|
|
*/
|
|
iterator
|
|
lower_bound(const key_type& __x)
|
|
{ return _M_t.lower_bound(__x); }
|
|
|
|
const_iterator
|
|
lower_bound(const key_type& __x) const
|
|
{ return _M_t.lower_bound(__x); }
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Finds the end of a subsequence matching given key.
|
|
* @param x Key to be located.
|
|
* @return Iterator pointing to the first element
|
|
* greater than key, or end().
|
|
*/
|
|
iterator
|
|
upper_bound(const key_type& __x)
|
|
{ return _M_t.upper_bound(__x); }
|
|
|
|
const_iterator
|
|
upper_bound(const key_type& __x) const
|
|
{ return _M_t.upper_bound(__x); }
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Finds a subsequence matching given key.
|
|
* @param x Key to be located.
|
|
* @return Pair of iterators that possibly points to the subsequence
|
|
* matching given key.
|
|
*
|
|
* This function is equivalent to
|
|
* @code
|
|
* std::make_pair(c.lower_bound(val),
|
|
* c.upper_bound(val))
|
|
* @endcode
|
|
* (but is faster than making the calls separately).
|
|
*
|
|
* This function probably only makes sense for multisets.
|
|
*/
|
|
std::pair<iterator, iterator>
|
|
equal_range(const key_type& __x)
|
|
{ return _M_t.equal_range(__x); }
|
|
|
|
std::pair<const_iterator, const_iterator>
|
|
equal_range(const key_type& __x) const
|
|
{ return _M_t.equal_range(__x); }
|
|
|
|
template<typename _K1, typename _C1, typename _A1>
|
|
friend bool
|
|
operator==(const multiset<_K1, _C1, _A1>&,
|
|
const multiset<_K1, _C1, _A1>&);
|
|
|
|
template<typename _K1, typename _C1, typename _A1>
|
|
friend bool
|
|
operator< (const multiset<_K1, _C1, _A1>&,
|
|
const multiset<_K1, _C1, _A1>&);
|
|
};
|
|
|
|
/**
|
|
* @brief Multiset equality comparison.
|
|
* @param x A %multiset.
|
|
* @param y A %multiset of the same type as @a x.
|
|
* @return True iff the size and elements of the multisets are equal.
|
|
*
|
|
* This is an equivalence relation. It is linear in the size of the
|
|
* multisets.
|
|
* Multisets are considered equivalent if their sizes are equal, and if
|
|
* corresponding elements compare equal.
|
|
*/
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator==(const multiset<_Key, _Compare, _Alloc>& __x,
|
|
const multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ return __x._M_t == __y._M_t; }
|
|
|
|
/**
|
|
* @brief Multiset ordering relation.
|
|
* @param x A %multiset.
|
|
* @param y A %multiset of the same type as @a x.
|
|
* @return True iff @a x is lexicographically less than @a y.
|
|
*
|
|
* This is a total ordering relation. It is linear in the size of the
|
|
* maps. The elements must be comparable with @c <.
|
|
*
|
|
* See std::lexicographical_compare() for how the determination is made.
|
|
*/
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator<(const multiset<_Key, _Compare, _Alloc>& __x,
|
|
const multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ return __x._M_t < __y._M_t; }
|
|
|
|
/// Returns !(x == y).
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator!=(const multiset<_Key, _Compare, _Alloc>& __x,
|
|
const multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Returns y < x.
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator>(const multiset<_Key,_Compare,_Alloc>& __x,
|
|
const multiset<_Key,_Compare,_Alloc>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Returns !(y < x)
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator<=(const multiset<_Key, _Compare, _Alloc>& __x,
|
|
const multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Returns !(x < y)
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator>=(const multiset<_Key, _Compare, _Alloc>& __x,
|
|
const multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
/// See std::multiset::swap().
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline void
|
|
swap(multiset<_Key, _Compare, _Alloc>& __x,
|
|
multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline void
|
|
swap(multiset<_Key, _Compare, _Alloc>&& __x,
|
|
multiset<_Key, _Compare, _Alloc>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
template<typename _Key, typename _Compare, typename _Alloc>
|
|
inline void
|
|
swap(multiset<_Key, _Compare, _Alloc>& __x,
|
|
multiset<_Key, _Compare, _Alloc>&& __y)
|
|
{ __x.swap(__y); }
|
|
#endif
|
|
|
|
_GLIBCXX_END_NESTED_NAMESPACE
|
|
|
|
#endif /* _STL_MULTISET_H */
|