author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 14:06:43 +0300 | |
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// Copyright (C) Vladimir Prus 2003. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/graph/vector_property_map.html for |
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// documentation. |
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// |
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#ifndef VECTOR_PROPERTY_MAP_HPP_VP_2003_03_04 |
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#define VECTOR_PROPERTY_MAP_HPP_VP_2003_03_04 |
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#include <boost/property_map.hpp> |
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#include <boost/shared_ptr.hpp> |
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#include <vector> |
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namespace boost { |
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template<typename T, typename IndexMap = identity_property_map> |
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class vector_property_map |
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: public boost::put_get_helper< |
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typename std::iterator_traits< |
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typename std::vector<T>::iterator >::reference, |
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vector_property_map<T, IndexMap> > |
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{ |
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public: |
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typedef typename property_traits<IndexMap>::key_type key_type; |
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typedef T value_type; |
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typedef typename std::iterator_traits< |
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typename std::vector<T>::iterator >::reference reference; |
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typedef boost::lvalue_property_map_tag category; |
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vector_property_map(const IndexMap& index = IndexMap()) |
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: store(new std::vector<T>()), index(index) |
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{} |
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vector_property_map(unsigned initial_size, |
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const IndexMap& index = IndexMap()) |
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: store(new std::vector<T>(initial_size)), index(index) |
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{} |
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typename std::vector<T>::iterator storage_begin() |
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{ |
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return store->begin(); |
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} |
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typename std::vector<T>::iterator storage_end() |
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{ |
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return store->end(); |
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} |
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typename std::vector<T>::const_iterator storage_begin() const |
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{ |
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return store->begin(); |
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} |
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typename std::vector<T>::const_iterator storage_end() const |
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{ |
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return store->end(); |
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} |
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public: |
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// Copy ctor absent, default semantics is OK. |
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// Assignment operator absent, default semantics is OK. |
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// CONSIDER: not sure that assignment to 'index' is correct. |
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reference operator[](const key_type& v) const { |
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typename property_traits<IndexMap>::value_type i = get(index, v); |
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if (static_cast<unsigned>(i) >= store->size()) { |
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store->resize(i + 1, T()); |
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} |
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return (*store)[i]; |
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} |
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private: |
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// Conceptually, we have a vector of infinite size. For practical |
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// purposes, we start with an empty vector and grow it as needed. |
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// Note that we cannot store pointer to vector here -- we cannot |
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// store pointer to data, because if copy of property map resizes |
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// the vector, the pointer to data will be invalidated. |
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// I wonder if class 'pmap_ref' is simply needed. |
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shared_ptr< std::vector<T> > store; |
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IndexMap index; |
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}; |
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template<typename T, typename IndexMap> |
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vector_property_map<T, IndexMap> |
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make_vector_property_map(IndexMap index) |
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{ |
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return vector_property_map<T, IndexMap>(index); |
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} |
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} |
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#endif |