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// (C) Copyright 2007-2009 Andrew Sutton
//
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0 (See accompanying file
// LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GRAPH_CONSTANT_PROPERTY_HPP
#define BOOST_GRAPH_CONSTANT_PROPERTY_HPP
#include <boost/property_map/property_map.hpp>
// TODO: This should really be part of the property maps library rather than
// the Boost.Graph library.
namespace boost
{
/**
* A constant property is one, that regardless of the edge or vertex given,
* will always return a constant value.
*/
template < typename Key, typename Value >
struct constant_property_map : public boost::put_get_helper< const Value&,
constant_property_map< Key, Value > >
{
typedef Key key_type;
typedef Value value_type;
typedef const Value& reference;
typedef boost::readable_property_map_tag category;
constant_property_map() : m_value() {}
constant_property_map(const value_type& value) : m_value(value) {}
constant_property_map(const constant_property_map& copy)
: m_value(copy.m_value)
{
}
inline reference operator[](const key_type&) const { return m_value; }
value_type m_value;
};
template < typename Key, typename Value >
inline constant_property_map< Key, Value > make_constant_property(
const Value& value)
{
return constant_property_map< Key, Value >(value);
}
/**
* Same as above, but pretends to be writable as well.
*/
template < typename Key, typename Value > struct constant_writable_property_map
{
typedef Key key_type;
typedef Value value_type;
typedef Value& reference;
typedef boost::read_write_property_map_tag category;
constant_writable_property_map() : m_value() {}
constant_writable_property_map(const value_type& value) : m_value(value) {}
constant_writable_property_map(const constant_writable_property_map& copy)
: m_value(copy.m_value)
{
}
friend Value get(const constant_writable_property_map& me, Key)
{
return me.m_value;
}
friend void put(const constant_writable_property_map&, Key, Value) {}
value_type m_value;
};
template < typename Key, typename Value >
inline constant_writable_property_map< Key, Value >
make_constant_writable_property(const Value& value)
{
return constant_writable_property_map< Key, Value >(value);
}
} /* namespace boost */
#endif