Ichthyostega
2530e8c1a1
sketch of an idea how to add an extension possibility without messing up the basic MultiFact template
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
/*
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MULTIFACT-ARG.hpp - variant of family-of-object factory, accepting fabrication arguments
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Copyright (C) Lumiera.org
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2009, 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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/** @file multifact.hpp
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** Extension allowing the MultiFact to pass arguments to the fabrication.
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** This extension is implemented by template specialisations and thus kicks in
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** when specifying a function \em signature as factory "product type". The resulting
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** factory class exposes a function call operator matching this signature, additionally
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** expecting the ID (to select the specific fabrication function) as first parameter.
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**
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** @todo WIP-WIP-WIP ... does this work out as intended?? TICKET #377
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**
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** @see multifact-argument-test.cpp
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** @see query-resolver.cpp usage example
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** @see multifact.hpp standard case
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*/
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#ifndef LIB_MULTIFACT_ARG_H
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#define LIB_MULTIFACT_ARG_H
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#include "lib/multifact.hpp"
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namespace lib {
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namespace factory {
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using std::tr1::function;
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template<typename TY, typename ARG>
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struct FabTraits<TY(ARG)>
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{
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typedef TY RawProduct;
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typedef RawProduct FacSig(ARG);
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typedef ARG Argument;
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};
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/**
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* Variant of MultiFact, selecting a creator function by ID
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* with the ability to pass additional argument(s) to this
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* creator function on invocation.
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* TODO type comment
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*/
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template< typename SIG,
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, typename ID
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, template<class> class Wrapper
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>
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class MultiFact<function<SIG>, ID, Wrapper>
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: public MultiFact<SIG,ID,Wrapper>
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{
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typedef typename FabTraits<SIG>::Argument ArgType;
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public:
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Product
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operator() (ID const& id, ArgType arg)
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{
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Creator& func = selectProducer (id);
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return wrap (func(arg));
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}
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};
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} // namespace factory
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// TODO is there some suitable standard configuration we could provide here??
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} // namespace lib
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#endif
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