Chris@16: // Copyright (C) 2007 Douglas Gregor 
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: // This file contains a simplification of the "trigger" method for
Chris@16: // process groups. The simple trigger handles the common case where
Chris@16: // the handler associated with a trigger is a member function bound to
Chris@16: // a particular pointer.
Chris@16: 
Chris@16: #ifndef BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP
Chris@16: #define BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP
Chris@16: 
Chris@16: #ifndef BOOST_GRAPH_USE_MPI
Chris@16: #error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/graph/parallel/process_group.hpp>
Chris@16: 
Chris@16: namespace boost { namespace graph { namespace parallel {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: /**
Chris@16:  * INTERNAL ONLY
Chris@16:  *
Chris@16:  * The actual function object that bridges from the normal trigger
Chris@16:  * interface to the simplified interface. This is the equivalent of
Chris@16:  * bind(pmf, self, _1, _2, _3, _4), but without the compile-time
Chris@16:  * overhead of bind.
Chris@16:  */
Chris@16: template<typename Class, typename T, typename Result>
Chris@16: class simple_trigger_t 
Chris@16: {
Chris@16: public:
Chris@16:   simple_trigger_t(Class* self, 
Chris@16:                    Result (Class::*pmf)(int, int, const T&, 
Chris@16:                                         trigger_receive_context))
Chris@16:     : self(self), pmf(pmf) { }
Chris@16: 
Chris@16:   Result 
Chris@16:   operator()(int source, int tag, const T& data, 
Chris@16:              trigger_receive_context context) const
Chris@16:   {
Chris@16:     return (self->*pmf)(source, tag, data, context);
Chris@16:   }
Chris@16: 
Chris@16: private:
Chris@16:   Class* self;
Chris@16:   Result (Class::*pmf)(int, int, const T&, trigger_receive_context);
Chris@16: };
Chris@16: 
Chris@16: } // end namespace detail
Chris@16: 
Chris@16: /**
Chris@16:  * Simplified trigger interface that reduces the amount of code
Chris@16:  * required to connect a process group trigger to a handler that is
Chris@16:  * just a bound member function.
Chris@16:  *
Chris@16:  * INTERNAL ONLY
Chris@16:  */
Chris@16: template<typename ProcessGroup, typename Class, typename T>
Chris@16: inline void 
Chris@16: simple_trigger(ProcessGroup& pg, int tag, Class* self, 
Chris@16:                void (Class::*pmf)(int source, int tag, const T& data, 
Chris@16:                                   trigger_receive_context context), int)
Chris@16: {
Chris@16:   pg.template trigger<T>(tag, 
Chris@16:                          detail::simple_trigger_t<Class, T, void>(self, pmf));
Chris@16: }
Chris@16: 
Chris@16: /**
Chris@16:  * Simplified trigger interface that reduces the amount of code
Chris@16:  * required to connect a process group trigger with a reply to a
Chris@16:  * handler that is just a bound member function.
Chris@16:  *
Chris@16:  * INTERNAL ONLY
Chris@16:  */
Chris@16: template<typename ProcessGroup, typename Class, typename T, typename Result>
Chris@16: inline void 
Chris@16: simple_trigger(ProcessGroup& pg, int tag, Class* self, 
Chris@16:                Result (Class::*pmf)(int source, int tag, const T& data, 
Chris@16:                                     trigger_receive_context context), long)
Chris@16: {
Chris@16:   pg.template trigger_with_reply<T>
Chris@16:     (tag, detail::simple_trigger_t<Class, T, Result>(self, pmf));
Chris@16: }
Chris@16: 
Chris@16: /**
Chris@16:  * Simplified trigger interface that reduces the amount of code
Chris@16:  * required to connect a process group trigger to a handler that is
Chris@16:  * just a bound member function.
Chris@16:  */
Chris@16: template<typename ProcessGroup, typename Class, typename T, typename Result>
Chris@16: inline void 
Chris@16: simple_trigger(ProcessGroup& pg, int tag, Class* self, 
Chris@16:                Result (Class::*pmf)(int source, int tag, const T& data, 
Chris@16:                                     trigger_receive_context context))
Chris@16: {
Chris@16:         // We pass 0 (an int) to help VC++ disambiguate calls to simple_trigger 
Chris@16:         // with Result=void.
Chris@16:         simple_trigger(pg, tag, self, pmf, 0); 
Chris@16: }
Chris@16: 
Chris@16: } } } // end namespace boost::graph::parallel
Chris@16: 
Chris@16: #endif // BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP