Chris@16: // Copyright 2004 The Trustees of Indiana University.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software
Chris@16: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  Authors: Douglas Gregor
Chris@16: //           Andrew Lumsdaine
Chris@16: #ifndef BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP
Chris@16: #define BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP
Chris@16: 
Chris@16: #include <boost/property_map/property_map.hpp>
Chris@16: 
Chris@16: namespace boost { 
Chris@16: 
Chris@16: // This probably doesn't belong here
Chris@16: template<typename Key, typename Value>
Chris@16: inline void local_put(dummy_property_map, const Key&, const Value&) {}
Chris@16: 
Chris@16: namespace parallel {
Chris@16: 
Chris@16: /** Property map that caches values placed in it but does not
Chris@16:  * broadcast values to remote processors.  This class template is
Chris@16:  * meant as an adaptor for @ref distributed_property_map that
Chris@16:  * suppresses communication in the event of a remote @c put operation
Chris@16:  * by mapping it to a local @c put operation.
Chris@16:  *
Chris@16:  * @todo Find a better name for @ref caching_property_map
Chris@16:  */
Chris@16: template<typename PropertyMap>
Chris@16: class caching_property_map
Chris@16: {
Chris@16: public:
Chris@16:   typedef typename property_traits<PropertyMap>::key_type   key_type;
Chris@16:   typedef typename property_traits<PropertyMap>::value_type value_type;
Chris@16:   typedef typename property_traits<PropertyMap>::reference  reference;
Chris@16:   typedef typename property_traits<PropertyMap>::category   category;
Chris@16: 
Chris@16:   explicit caching_property_map(const PropertyMap& property_map)
Chris@16:     : property_map(property_map) {}
Chris@16: 
Chris@16:   PropertyMap&        base()       { return property_map; }
Chris@16:   const PropertyMap&  base() const { return property_map; }
Chris@16: 
Chris@16:   template<typename Reduce>
Chris@16:   void set_reduce(const Reduce& reduce)
Chris@16:   { property_map.set_reduce(reduce); }
Chris@16: 
Chris@16:   void reset() { property_map.reset(); }
Chris@16: 
Chris@16: #if 0
Chris@16:   reference operator[](const key_type& key) const
Chris@16:   {
Chris@16:     return property_map[key];
Chris@16:   }
Chris@16: #endif
Chris@16: 
Chris@16: private:
Chris@16:   PropertyMap property_map;
Chris@16: };
Chris@16: 
Chris@16: template<typename PropertyMap, typename Key>
Chris@16: inline typename caching_property_map<PropertyMap>::value_type
Chris@16: get(const caching_property_map<PropertyMap>& pm, const Key& key)
Chris@16: { return get(pm.base(), key); }
Chris@16: 
Chris@16: template<typename PropertyMap, typename Key, typename Value>
Chris@16: inline void
Chris@16: local_put(const caching_property_map<PropertyMap>& pm, const Key& key,
Chris@16:           const Value& value)
Chris@16: { local_put(pm.base(), key, value); }
Chris@16: 
Chris@16: template<typename PropertyMap, typename Key, typename Value>
Chris@16: inline void
Chris@16: cache(const caching_property_map<PropertyMap>& pm, const Key& key,
Chris@16:       const Value& value)
Chris@16: { cache(pm.base(), key, value); }
Chris@16: 
Chris@16: template<typename PropertyMap, typename Key, typename Value>
Chris@16: inline void
Chris@16: put(const caching_property_map<PropertyMap>& pm, const Key& key,
Chris@16:     const Value& value)
Chris@16: { local_put(pm.base(), key, value); }
Chris@16: 
Chris@16: template<typename PropertyMap>
Chris@16: inline caching_property_map<PropertyMap>
Chris@16: make_caching_property_map(const PropertyMap& pm)
Chris@16: { return caching_property_map<PropertyMap>(pm); }
Chris@16: 
Chris@16: } } // end namespace boost::parallel
Chris@16: 
Chris@16: #endif // BOOST_PARALLEL_CACHING_PROPERTY_MAP_HPP