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// Copyright 2004 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Douglas Gregor
// Andrew Lumsdaine
#ifndef BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP
#define BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP
#ifndef BOOST_GRAPH_USE_MPI
#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
#endif
#include <boost/property_map/property_map.hpp>
namespace boost {
// This probably doesn't belong here
template<typename Key, typename Value>
inline void local_put(dummy_property_map, const Key&, const Value&) {}
namespace parallel {
/** Property map that caches values placed in it but does not
* broadcast values to remote processors. This class template is
* meant as an adaptor for @ref distributed_property_map that
* suppresses communication in the event of a remote @c put operation
* by mapping it to a local @c put operation.
*
* @todo Find a better name for @ref caching_property_map
*/
template<typename PropertyMap>
class caching_property_map
{
public:
typedef typename property_traits<PropertyMap>::key_type key_type;
typedef typename property_traits<PropertyMap>::value_type value_type;
typedef typename property_traits<PropertyMap>::reference reference;
typedef typename property_traits<PropertyMap>::category category;
explicit caching_property_map(const PropertyMap& property_map)
: property_map(property_map) {}
PropertyMap& base() { return property_map; }
const PropertyMap& base() const { return property_map; }
template<typename Reduce>
void set_reduce(const Reduce& reduce)
{ property_map.set_reduce(reduce); }
void reset() { property_map.reset(); }
#if 0
reference operator[](const key_type& key) const
{
return property_map[key];
}
#endif
private:
PropertyMap property_map;
};
template<typename PropertyMap, typename Key>
inline typename caching_property_map<PropertyMap>::value_type
get(const caching_property_map<PropertyMap>& pm, const Key& key)
{ return get(pm.base(), key); }
template<typename PropertyMap, typename Key, typename Value>
inline void
local_put(const caching_property_map<PropertyMap>& pm, const Key& key,
const Value& value)
{ local_put(pm.base(), key, value); }
template<typename PropertyMap, typename Key, typename Value>
inline void
cache(const caching_property_map<PropertyMap>& pm, const Key& key,
const Value& value)
{ cache(pm.base(), key, value); }
template<typename PropertyMap, typename Key, typename Value>
inline void
put(const caching_property_map<PropertyMap>& pm, const Key& key,
const Value& value)
{ local_put(pm.base(), key, value); }
template<typename PropertyMap>
inline caching_property_map<PropertyMap>
make_caching_property_map(const PropertyMap& pm)
{ return caching_property_map<PropertyMap>(pm); }
} } // end namespace boost::parallel
#endif // BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP
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