109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
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// Copyright (C) 2007 Douglas Gregor
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See 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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// This file contains a simplification of the "trigger" method for
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// process groups. The simple trigger handles the common case where
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// the handler associated with a trigger is a member function bound to
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// a particular pointer.
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#ifndef BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP
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#define BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP
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#ifndef BOOST_GRAPH_USE_MPI
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#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
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#endif
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#include <boost/graph/parallel/process_group.hpp>
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namespace boost { namespace graph { namespace parallel {
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namespace detail {
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/**
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* INTERNAL ONLY
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*
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* The actual function object that bridges from the normal trigger
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* interface to the simplified interface. This is the equivalent of
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* bind(pmf, self, _1, _2, _3, _4), but without the compile-time
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* overhead of bind.
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*/
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template<typename Class, typename T, typename Result>
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class simple_trigger_t
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{
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public:
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simple_trigger_t(Class* self,
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Result (Class::*pmf)(int, int, const T&,
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trigger_receive_context))
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: self(self), pmf(pmf) { }
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Result
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operator()(int source, int tag, const T& data,
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trigger_receive_context context) const
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{
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return (self->*pmf)(source, tag, data, context);
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}
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private:
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Class* self;
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Result (Class::*pmf)(int, int, const T&, trigger_receive_context);
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};
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} // end namespace detail
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/**
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* Simplified trigger interface that reduces the amount of code
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* required to connect a process group trigger to a handler that is
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* just a bound member function.
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*
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* INTERNAL ONLY
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*/
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template<typename ProcessGroup, typename Class, typename T>
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inline void
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simple_trigger(ProcessGroup& pg, int tag, Class* self,
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void (Class::*pmf)(int source, int tag, const T& data,
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trigger_receive_context context), int)
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{
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pg.template trigger<T>(tag,
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detail::simple_trigger_t<Class, T, void>(self, pmf));
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}
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/**
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* Simplified trigger interface that reduces the amount of code
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* required to connect a process group trigger with a reply to a
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* handler that is just a bound member function.
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*
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* INTERNAL ONLY
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*/
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template<typename ProcessGroup, typename Class, typename T, typename Result>
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inline void
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simple_trigger(ProcessGroup& pg, int tag, Class* self,
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Result (Class::*pmf)(int source, int tag, const T& data,
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trigger_receive_context context), long)
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{
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pg.template trigger_with_reply<T>
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(tag, detail::simple_trigger_t<Class, T, Result>(self, pmf));
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}
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/**
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* Simplified trigger interface that reduces the amount of code
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* required to connect a process group trigger to a handler that is
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* just a bound member function.
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*/
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template<typename ProcessGroup, typename Class, typename T, typename Result>
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inline void
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simple_trigger(ProcessGroup& pg, int tag, Class* self,
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Result (Class::*pmf)(int source, int tag, const T& data,
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trigger_receive_context context))
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{
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// We pass 0 (an int) to help VC++ disambiguate calls to simple_trigger
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// with Result=void.
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simple_trigger(pg, tag, self, pmf, 0);
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}
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} } } // end namespace boost::graph::parallel
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#endif // BOOST_GRAPH_PARALLEL_SIMPLE_TRIGGER_HPP
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