88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/*
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FUNCTORUTIL.hpp - collection of helpers for dealing with functors and signals
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef FUNCTORUTIL_H_
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#define FUNCTORUTIL_H_
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#include <tr1/functional>
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namespace util { ////////////TODO: refactor it. But probably not directly into namespace lib. Needs some more consideration though
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using std::tr1::function;
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using std::tr1::bind;
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using std::tr1::placeholders::_1;
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/** "Combiner" which calls two functions one after another
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* returning the result of the second invocation. */
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template<typename SIG>
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class CombineSequenced;
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template<typename ARG, typename RET>
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struct CombineSequenced<RET(ARG)>
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{
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typedef function<RET(ARG)> Func;
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static RET
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dispatch (Func first, Func second, ARG arg)
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{
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first (arg);
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return second (arg);
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}
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};
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template< typename SIG
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, class COM = CombineSequenced<SIG>
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>
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class Dispatch
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: public function<SIG>
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{
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typedef typename COM::Func Func;
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public:
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Dispatch (Func const& f1,
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Func const& f2)
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: Func (bind (&COM::dispatch, f1, f2, _1))
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{ }
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};
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/** convenience shortcut to call two functors in sequence.
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* @return a Dispatch functor object which incorporates the
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* functors as copy and on invocation calls the first
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* function and then returns the result of the second */
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template<typename SIG>
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Dispatch<SIG>
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dispatchSequenced (function<SIG> const& f1,
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function<SIG> const& f2)
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{
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return Dispatch<SIG> (f1, f2);
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}
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} // namespace util
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#endif /*UTIL_HPP_*/
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