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- // Map implementation -*- C++ -*-
-
- // Copyright (C) 2001, 2002 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 2, or (at your option)
- // any later version.
-
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
-
- // You should have received a copy of the GNU General Public License along
- // with this library; see the file COPYING. If not, write to the Free
- // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- // USA.
-
- // As a special exception, you may use this file as part of a free software
- // library without restriction. Specifically, if other files instantiate
- // templates or use macros or inline functions from this file, or you compile
- // this file and link it with other files to produce an executable, this
- // file does not by itself cause the resulting executable to be covered by
- // the GNU General Public License. This exception does not however
- // invalidate any other reasons why the executable file might be covered by
- // the GNU General Public License.
-
- /*
- *
- * Copyright (c) 1994
- * Hewlett-Packard Company
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. Hewlett-Packard Company makes no
- * representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied warranty.
- *
- *
- * Copyright (c) 1996,1997
- * Silicon Graphics Computer Systems, Inc.
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. Silicon Graphics makes no
- * representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied warranty.
- */
-
- /** @file stl_map.h
- * This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
- */
-
- #ifndef _CPP_BITS_STL_MAP_H
- #define _CPP_BITS_STL_MAP_H 1
-
- #include <bits/concept_check.h>
-
- namespace std
- {
-
- /**
- * @brief A standard container made up of pairs (see std::pair in <utility>)
- * which can be retrieved based on a key.
- *
- * This is an associative container. Values contained within it can be
- * quickly retrieved through a key element. Example: MyMap["First"] would
- * return the data associated with the key "First".
- */
- template <class _Key, class _Tp, class _Compare = less<_Key>,
- class _Alloc = allocator<pair<const _Key, _Tp> > >
- class map
- {
- // concept requirements
- __glibcpp_class_requires(_Tp, _SGIAssignableConcept)
- __glibcpp_class_requires4(_Compare, bool, _Key, _Key, _BinaryFunctionConcept);
-
- public:
- // typedefs:
- typedef _Key key_type;
- typedef _Tp data_type;
- typedef _Tp mapped_type;
- typedef pair<const _Key, _Tp> value_type;
- typedef _Compare key_compare;
-
- class value_compare
- : public binary_function<value_type, value_type, bool> {
- friend class map<_Key,_Tp,_Compare,_Alloc>;
- protected :
- _Compare comp;
- value_compare(_Compare __c) : comp(__c) {}
- public:
- bool operator()(const value_type& __x, const value_type& __y) const {
- return comp(__x.first, __y.first);
- }
- };
-
- private:
- typedef _Rb_tree<key_type, value_type,
- _Select1st<value_type>, key_compare, _Alloc> _Rep_type;
- _Rep_type _M_t; // red-black tree representing map
- public:
- typedef typename _Rep_type::pointer pointer;
- typedef typename _Rep_type::const_pointer const_pointer;
- typedef typename _Rep_type::reference reference;
- typedef typename _Rep_type::const_reference const_reference;
- typedef typename _Rep_type::iterator iterator;
- typedef typename _Rep_type::const_iterator const_iterator;
- typedef typename _Rep_type::reverse_iterator reverse_iterator;
- typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
- typedef typename _Rep_type::size_type size_type;
- typedef typename _Rep_type::difference_type difference_type;
- typedef typename _Rep_type::allocator_type allocator_type;
-
- // allocation/deallocation
-
- map() : _M_t(_Compare(), allocator_type()) {}
- explicit map(const _Compare& __comp,
- const allocator_type& __a = allocator_type())
- : _M_t(__comp, __a) {}
-
- template <class _InputIterator>
- map(_InputIterator __first, _InputIterator __last)
- : _M_t(_Compare(), allocator_type())
- { _M_t.insert_unique(__first, __last); }
-
- template <class _InputIterator>
- map(_InputIterator __first, _InputIterator __last, const _Compare& __comp,
- const allocator_type& __a = allocator_type())
- : _M_t(__comp, __a) { _M_t.insert_unique(__first, __last); }
- map(const map<_Key,_Tp,_Compare,_Alloc>& __x) : _M_t(__x._M_t) {}
-
- map<_Key,_Tp,_Compare,_Alloc>&
- operator=(const map<_Key, _Tp, _Compare, _Alloc>& __x)
- {
- _M_t = __x._M_t;
- return *this;
- }
-
- // accessors:
-
- key_compare key_comp() const { return _M_t.key_comp(); }
- value_compare value_comp() const { return value_compare(_M_t.key_comp()); }
- allocator_type get_allocator() const { return _M_t.get_allocator(); }
-
- /**
- * Returns a read/write iterator that points to the first pair in the map.
- * Iteration is done in ascending order according to the keys.
- */
- iterator begin() { return _M_t.begin(); }
-
- /**
- * Returns a read-only (constant) iterator that points to the first pair
- * in the map. Iteration is done in ascending order according to the keys.
- */
- const_iterator begin() const { return _M_t.begin(); }
-
- /**
- * Returns a read/write iterator that points one past the last pair in the
- * map. Iteration is done in ascending order according to the keys.
- */
- iterator end() { return _M_t.end(); }
-
- /**
- * Returns a read-only (constant) iterator that points one past the last
- * pair in the map. Iteration is done in ascending order according to the
- * keys.
- */
- const_iterator end() const { return _M_t.end(); }
-
- /**
- * Returns a read/write reverse iterator that points to the last pair in
- * the map. Iteration is done in descending order according to the keys.
- */
- reverse_iterator rbegin() { return _M_t.rbegin(); }
-
- /**
- * Returns a read-only (constant) reverse iterator that points to the last
- * pair in the map. Iteration is done in descending order according to
- * the keys.
- */
- const_reverse_iterator rbegin() const { return _M_t.rbegin(); }
-
- /**
- * Returns a read/write reverse iterator that points to one before the
- * first pair in the map. Iteration is done in descending order according
- * to the keys.
- */
- reverse_iterator rend() { return _M_t.rend(); }
-
- /**
- * Returns a read-only (constant) reverse iterator that points to one
- * before the first pair in the map. Iteration is done in descending order
- * according to the keys.
- */
- const_reverse_iterator rend() const { return _M_t.rend(); }
-
- /** Returns true if the map is empty. (Thus begin() would equal end().) */
- bool empty() const { return _M_t.empty(); }
- /** Returns the size of the map. */
- size_type size() const { return _M_t.size(); }
- /** Returns the maximum size of the map. */
- size_type max_size() const { return _M_t.max_size(); }
-
- /**
- * @brief Subscript ( [] ) access to map data.
- * @param k The key for which data should be retrieved.
- *
- * Allows for easy lookup with the subscript ( [] ) operator. Returns the
- * data associated with the key specified in subscript. If the key does
- * not exist a pair with that key is created with a default value, which
- * is then returned.
- */
- _Tp& operator[](const key_type& __k) {
- iterator __i = lower_bound(__k);
- // __i->first is greater than or equivalent to __k.
- if (__i == end() || key_comp()(__k, (*__i).first))
- __i = insert(__i, value_type(__k, _Tp()));
- return (*__i).second;
- }
-
- void swap(map<_Key,_Tp,_Compare,_Alloc>& __x) { _M_t.swap(__x._M_t); }
-
- // insert/erase
- /**
- * @brief Attempts to insert a std::pair into the map.
- * @param x Pair to be inserted (see std::make_pair for easy creation of
- * pairs).
- * @return A pair of which the first element is an iterator that points
- * to the possibly inserted pair, a second element of type bool
- * to show if the pair was actually inserted.
- *
- * This function attempts to insert a (key, value) pair into the map. A
- * map relies on unique keys and thus a pair is only inserted if its first
- * element (the key) is not already present in the map.
- */
- pair<iterator,bool> insert(const value_type& __x)
- { return _M_t.insert_unique(__x); }
-
- /**
- * @brief Attempts to insert a std::pair into the map.
- * @param position An iterator that serves as a hint as to where the
- * pair should be inserted.
- * @param x Pair to be inserted (see std::make_pair for easy creation of
- * pairs).
- * @return An iterator that points to the inserted (key,value) pair.
- *
- * This function is not concerned about whether the insertion took place
- * or not and thus does not return a boolean like the single-argument
- * insert() does. Note that the first parameter is only a hint and can
- * potentially improve the performance of the insertion process. A bad
- * hint would cause no gains in efficiency.
- */
- iterator insert(iterator position, const value_type& __x)
- { return _M_t.insert_unique(position, __x); }
-
- /**
- * @brief A template function that attemps to insert elements from
- * another range (possibly another map).
- * @param first Iterator pointing to the start of the range to be inserted.
- * @param last Iterator pointing to the end of the range.
- */
- template <class _InputIterator>
- void insert(_InputIterator __first, _InputIterator __last) {
- _M_t.insert_unique(__first, __last);
- }
-
- /**
- * @brief Erases an element from a map.
- * @param position An iterator pointing to the element to be erased.
- *
- * This function erases an element, pointed to by the given iterator, from
- * a map. Note that this function only erases the element, and that if
- * the element is itself a pointer, the pointed-to memory is not touched
- * in any way. Managing the pointer is the user's responsibilty.
- */
- void erase(iterator __position) { _M_t.erase(__position); }
-
- /**
- * @brief Erases an element according to the provided key.
- * @param x Key of element to be erased.
- * @return Doc me! (Number of elements that match key? Only makes sense
- * with multimap)
- *
- * This function erases an element, located by the given key, from a map.
- * Note that this function only erases the element, and that if
- * the element is itself a pointer, the pointed-to memory is not touched
- * in any way. Managing the pointer is the user's responsibilty.
- */
- size_type erase(const key_type& __x) { return _M_t.erase(__x); }
-
- /**
- * @brief Erases a [first,last) range of elements from a map.
- * @param first Iterator pointing to the start of the range to be erased.
- * @param last Iterator pointing to the end of the range to be erased.
- *
- * This function erases a sequence of elements from a map.
- * Note that this function only erases the element, and that if
- * the element is itself a pointer, the pointed-to memory is not touched
- * in any way. Managing the pointer is the user's responsibilty.
- */
- void erase(iterator __first, iterator __last)
- { _M_t.erase(__first, __last); }
-
- /** Erases all elements in a map. Note that this function only erases
- * the elements, and that if the elements themselves are pointers, the
- * pointed-to memory is not touched in any way. Managing the pointer is
- * the user's responsibilty.
- */
- void clear() { _M_t.clear(); }
-
- // map operations:
-
- /**
- * @brief Tries to locate an element in a map.
- * @param x Key of (key, value) pair 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 pair. If unsuccessful it returns the
- * one past the end ( end() ) iterator.
- */
- iterator find(const key_type& __x) { return _M_t.find(__x); }
-
- /**
- * @brief Tries to locate an element in a map.
- * @param x Key of (key, value) pair to be located.
- * @return Read-only (constant) 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 a constant iterator
- * pointing to the sought after pair. If unsuccessful it returns the
- * one past the end ( end() ) iterator.
- */
- const_iterator find(const key_type& __x) const { return _M_t.find(__x); }
-
- /**
- * @brief Finds the number of elements with given key.
- * @param x Key of (key, value) pairs to be located.
- * @return Number of elements with specified key.
- *
- * This function only makes sense for multimaps.
- */
- size_type count(const key_type& __x) const {
- return _M_t.find(__x) == _M_t.end() ? 0 : 1;
- }
-
- /**
- * @brief Finds the beginning of a subsequence matching given key.
- * @param x Key of (key, value) pair to be located.
- * @return Iterator pointing to first element matching given key, or
- * end() if not found.
- *
- * This function is useful only with std::multimap. It 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); }
-
- /**
- * @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
- * matching given key, or end() if not found.
- *
- * This function is useful only with std::multimap. It 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 last element matching given key.
- *
- * This function only makes sense with multimaps.
- */
- 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 last element matching
- * given key.
- *
- * This function only makes sense with multimaps.
- */
- 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 improves on lower_bound() and upper_bound() by giving a more
- * elegant and efficient solution. It returns a pair of which the first
- * element possibly points to the first element matching the given key
- * and the second element possibly points to the last element matching the
- * given key. If unsuccessful the first element of the returned pair will
- * contain an iterator pointing to the next greatest element or, if no such
- * greater element exists, to end().
- *
- * This function only makes sense for multimaps.
- */
- 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 improves on lower_bound() and upper_bound() by giving a more
- * elegant and efficient solution. It returns a pair of which the first
- * element possibly points to the first element matching the given key
- * and the second element possibly points to the last element matching the
- * given key. If unsuccessful the first element of the returned pair will
- * contain an iterator pointing to the next greatest element or, if no such
- * a greater element exists, to end().
- *
- * This function only makes sense for multimaps.
- */
- pair<const_iterator,const_iterator> equal_range(const key_type& __x) const {
- return _M_t.equal_range(__x);
- }
-
- template <class _K1, class _T1, class _C1, class _A1>
- friend bool operator== (const map<_K1, _T1, _C1, _A1>&,
- const map<_K1, _T1, _C1, _A1>&);
- template <class _K1, class _T1, class _C1, class _A1>
- friend bool operator< (const map<_K1, _T1, _C1, _A1>&,
- const map<_K1, _T1, _C1, _A1>&);
- };
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator==(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return __x._M_t == __y._M_t;
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator<(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return __x._M_t < __y._M_t;
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator!=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return !(__x == __y);
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator>(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return __y < __x;
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator<=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return !(__y < __x);
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline bool operator>=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
- const map<_Key,_Tp,_Compare,_Alloc>& __y) {
- return !(__x < __y);
- }
-
- template <class _Key, class _Tp, class _Compare, class _Alloc>
- inline void swap(map<_Key,_Tp,_Compare,_Alloc>& __x,
- map<_Key,_Tp,_Compare,_Alloc>& __y) {
- __x.swap(__y);
- }
-
- } // namespace std
-
- #endif /* _CPP_BITS_STL_MAP_H */
-
- // Local Variables:
- // mode:C++
- // End:
-