679 lines
25 KiB
C++
679 lines
25 KiB
C++
// Multimap implementation -*- C++ -*-
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// Copyright (C) 2001, 2002, 2004 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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 stl_multimap.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 _MULTIMAP_H
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#define _MULTIMAP_H 1
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#include <bits/concept_check.h>
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namespace __gnu_norm
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{
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// Forward declaration of operators < and ==, needed for friend declaration.
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template <typename _Key, typename _Tp,
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typename _Compare = less<_Key>,
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typename _Alloc = allocator<pair<const _Key, _Tp> > >
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class multimap;
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template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
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inline bool
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operator==(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
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const multimap<_Key,_Tp,_Compare,_Alloc>& __y);
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template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
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inline bool
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operator<(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
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const multimap<_Key,_Tp,_Compare,_Alloc>& __y);
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/**
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* @brief A standard container made up of (key,value) pairs, which can be
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* retrieved based on a key, in logarithmic time.
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*
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* @ingroup Containers
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* @ingroup Assoc_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 multimap<Key,T> the key_type is Key, the mapped_type
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* is T, and the value_type is std::pair<const Key,T>.
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*
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* Multimaps support bidirectional iterators.
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*
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* @if maint
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* The private tree data is declared exactly the same way for map and
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* multimap; 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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* @endif
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*/
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template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
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class multimap
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{
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// concept requirements
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__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
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__glibcxx_class_requires4(_Compare, bool, _Key, _Key,
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_BinaryFunctionConcept)
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public:
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typedef _Key key_type;
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typedef _Tp mapped_type;
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typedef pair<const _Key, _Tp> value_type;
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typedef _Compare key_compare;
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class value_compare
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: public binary_function<value_type, value_type, bool>
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{
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friend class multimap<_Key,_Tp,_Compare,_Alloc>;
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protected:
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_Compare comp;
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value_compare(_Compare __c)
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: comp(__c) { }
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public:
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bool operator()(const value_type& __x, const value_type& __y) const
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{ return comp(__x.first, __y.first); }
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};
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private:
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/// @if maint This turns a red-black tree into a [multi]map. @endif
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typedef _Rb_tree<key_type, value_type,
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_Select1st<value_type>, key_compare, _Alloc> _Rep_type;
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/// @if maint The actual tree structure. @endif
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_Rep_type _M_t;
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public:
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// many of these are specified differently in ISO, but the following are
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// "functionally equivalent"
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typedef typename _Rep_type::allocator_type allocator_type;
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typedef typename _Rep_type::reference reference;
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typedef typename _Rep_type::const_reference const_reference;
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typedef typename _Rep_type::iterator iterator;
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typedef typename _Rep_type::const_iterator const_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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typedef typename _Rep_type::pointer pointer;
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typedef typename _Rep_type::const_pointer const_pointer;
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typedef typename _Rep_type::reverse_iterator reverse_iterator;
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typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
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// [23.3.2] construct/copy/destroy
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// (get_allocator() is also listed in this section)
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/**
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* @brief Default constructor creates no elements.
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*/
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multimap()
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: _M_t(_Compare(), allocator_type()) { }
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// for some reason this was made a separate function
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/**
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* @brief Default constructor creates no elements.
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*/
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explicit
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multimap(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 %Multimap copy constructor.
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* @param x A %multimap of identical element and allocator types.
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*
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* The newly-created %multimap uses a copy of the allocation object used
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* by @a x.
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*/
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multimap(const multimap& __x)
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: _M_t(__x._M_t) { }
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/**
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* @brief Builds a %multimap 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 %multimap 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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multimap(_InputIterator __first, _InputIterator __last)
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: _M_t(_Compare(), allocator_type())
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{ _M_t.insert_equal(__first, __last); }
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/**
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* @brief Builds a %multimap 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 %multimap 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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multimap(_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.insert_equal(__first, __last); }
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// FIXME There is no dtor declared, but we should have something generated
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// by Doxygen. I don't know what tags to add to this paragraph to make
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// that happen:
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/**
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* The dtor only erases the elements, and note that if the elements
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* themselves are pointers, the pointed-to memory is not touched in any
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* way. Managing the pointer is the user's responsibilty.
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*/
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/**
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* @brief %Multimap assignment operator.
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* @param x A %multimap 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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multimap&
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operator=(const multimap& __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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/// Get a copy of 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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// iterators
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/**
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* Returns a read/write iterator that points to the first pair in the
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* %multimap. Iteration is done in ascending order according to the
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* keys.
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*/
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iterator
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begin()
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{ return _M_t.begin(); }
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/**
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* Returns a read-only (constant) iterator that points to the first pair
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* in the %multimap. Iteration is done in ascending order according to
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* the keys.
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*/
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const_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/write iterator that points one past the last pair in
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* the %multimap. Iteration is done in ascending order according to the
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* keys.
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*/
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iterator
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end()
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{ return _M_t.end(); }
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/**
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* Returns a read-only (constant) iterator that points one past the last
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* pair in the %multimap. Iteration is done in ascending order according
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* to the keys.
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*/
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const_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/write reverse iterator that points to the last pair in
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* the %multimap. Iteration is done in descending order according to the
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* keys.
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*/
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reverse_iterator
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rbegin()
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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 pair in the %multimap. Iteration is done in descending order
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* according to the keys.
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*/
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const_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/write reverse iterator that points to one before the
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* first pair in the %multimap. 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()
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{ return _M_t.rend(); }
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/**
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* Returns a read-only (constant) reverse iterator that points to one
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* before the first pair in the %multimap. Iteration is done in
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* descending order according to the keys.
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*/
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const_reverse_iterator
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rend() const
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{ return _M_t.rend(); }
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// capacity
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/** Returns true if the %multimap 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 %multimap. */
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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 %multimap. */
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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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// modifiers
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/**
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* @brief Inserts a std::pair into the %multimap.
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* @param x Pair to be inserted (see std::make_pair for easy creation
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* of pairs).
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* @return An iterator that points to the inserted (key,value) pair.
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*
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* This function inserts a (key, value) pair into the %multimap.
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* Contrary to a std::map the %multimap does not rely on unique keys and
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* thus multiple pairs with the same key 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.insert_equal(__x); }
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/**
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* @brief Inserts a std::pair into the %multimap.
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* @param position An iterator that serves as a hint as to where the
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* pair should be inserted.
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* @param x Pair to be inserted (see std::make_pair for easy creation
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* of pairs).
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* @return An iterator that points to the inserted (key,value) pair.
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*
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* This function inserts a (key, value) pair into the %multimap.
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* Contrary to a std::map the %multimap does not rely on unique keys and
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* thus multiple pairs with the same key can be inserted.
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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++/23_containers/howto.html#4
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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.insert_equal(__position, __x); }
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/**
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* @brief A template function that attemps 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.insert_equal(__first, __last); }
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/**
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* @brief Erases an element from a %multimap.
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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 %multimap. 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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* responsibilty.
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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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* %multimap.
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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 responsibilty.
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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 %multimap.
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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 %multimap.
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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 responsibilty.
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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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* @brief Swaps data with another %multimap.
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* @param x A %multimap of the same element and allocator types.
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*
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* This exchanges the elements between two multimaps in constant time.
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* (It is only swapping a pointer, an integer, and an instance of
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* the @c Compare type (which itself is often stateless and empty), so it
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* should be quite fast.)
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* Note that the global std::swap() function is specialized such that
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* std::swap(m1,m2) will feed to this function.
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*/
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void
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swap(multimap& __x)
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{ _M_t.swap(__x._M_t); }
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/**
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* Erases all elements in a %multimap. 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 responsibilty.
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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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// observers
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/**
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* Returns the key comparison object out of which the %multimap
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* was constructed.
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*/
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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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/**
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* Returns a value comparison object, built from the key comparison
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* object out of which the %multimap was constructed.
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*/
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value_compare
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value_comp() const
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{ return value_compare(_M_t.key_comp()); }
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// multimap operations
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/**
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* @brief Tries to locate an element in a %multimap.
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* @param x Key of (key, value) pair to be located.
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* @return Iterator pointing to sought-after element,
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* or end() if not found.
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*
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* This function takes a key and tries to locate the element with which
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* the key matches. If successful the function returns an iterator
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* pointing to the sought after %pair. If unsuccessful it returns the
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* past-the-end ( @c end() ) iterator.
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*/
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iterator
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find(const key_type& __x)
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{ return _M_t.find(__x); }
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/**
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* @brief Tries to locate an element in a %multimap.
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* @param x Key of (key, value) pair to be located.
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* @return Read-only (constant) iterator pointing to sought-after
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* element, or end() if not found.
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*
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* This function takes a key and tries to locate the element with which
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* the key matches. If successful the function returns a constant
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* iterator pointing to the sought after %pair. If unsuccessful it
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* returns the past-the-end ( @c end() ) iterator.
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*/
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const_iterator
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find(const key_type& __x) const
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{ return _M_t.find(__x); }
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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 (key, value) pairs 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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|
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/**
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|
* @brief Finds the beginning of a subsequence matching given key.
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|
* @param x Key of (key, value) pair 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); }
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|
|
|
/**
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|
* @brief Finds the beginning of a subsequence matching given key.
|
|
* @param x Key of (key, value) pair to be located.
|
|
* @return Read-only (constant) 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 the iterator will point
|
|
* to the next greatest element or, if no such greater element exists, to
|
|
* end().
|
|
*/
|
|
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 of (key, value) pair 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); }
|
|
|
|
/**
|
|
* @brief Finds the end of a subsequence matching given key.
|
|
* @param x Key of (key, value) pair to be located.
|
|
* @return Read-only (constant) iterator pointing to first iterator
|
|
* greater than key, or end().
|
|
*/
|
|
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 of (key, value) pairs 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).
|
|
*/
|
|
pair<iterator,iterator>
|
|
equal_range(const key_type& __x)
|
|
{ return _M_t.equal_range(__x); }
|
|
|
|
/**
|
|
* @brief Finds a subsequence matching given key.
|
|
* @param x Key of (key, value) pairs to be located.
|
|
* @return Pair of read-only (constant) 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).
|
|
*/
|
|
pair<const_iterator,const_iterator>
|
|
equal_range(const key_type& __x) const
|
|
{ return _M_t.equal_range(__x); }
|
|
|
|
template <typename _K1, typename _T1, typename _C1, typename _A1>
|
|
friend bool
|
|
operator== (const multimap<_K1,_T1,_C1,_A1>&,
|
|
const multimap<_K1,_T1,_C1,_A1>&);
|
|
|
|
template <typename _K1, typename _T1, typename _C1, typename _A1>
|
|
friend bool
|
|
operator< (const multimap<_K1,_T1,_C1,_A1>&,
|
|
const multimap<_K1,_T1,_C1,_A1>&);
|
|
};
|
|
|
|
/**
|
|
* @brief Multimap equality comparison.
|
|
* @param x A %multimap.
|
|
* @param y A %multimap of the same type as @a x.
|
|
* @return True iff the size and elements of the maps are equal.
|
|
*
|
|
* This is an equivalence relation. It is linear in the size of the
|
|
* multimaps. Multimaps are considered equivalent if their sizes are equal,
|
|
* and if corresponding elements compare equal.
|
|
*/
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator==(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return __x._M_t == __y._M_t; }
|
|
|
|
/**
|
|
* @brief Multimap ordering relation.
|
|
* @param x A %multimap.
|
|
* @param y A %multimap 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
|
|
* multimaps. The elements must be comparable with @c <.
|
|
*
|
|
* See std::lexicographical_compare() for how the determination is made.
|
|
*/
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator<(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return __x._M_t < __y._M_t; }
|
|
|
|
/// Based on operator==
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator!=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Based on operator<
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator>(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Based on operator<
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator<=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Based on operator<
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline bool
|
|
operator>=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
const multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
/// See std::multimap::swap().
|
|
template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
|
|
inline void
|
|
swap(multimap<_Key,_Tp,_Compare,_Alloc>& __x,
|
|
multimap<_Key,_Tp,_Compare,_Alloc>& __y)
|
|
{ __x.swap(__y); }
|
|
} // namespace __gnu_norm
|
|
|
|
#endif /* _MULTIMAP_H */
|