100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
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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/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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IndexMap& get_index_map() { return index; }
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const IndexMap& get_index_map() const { return index; }
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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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#ifdef BOOST_GRAPH_USE_MPI
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#include <boost/property_map/parallel/vector_property_map.hpp>
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#endif
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#endif
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