Ichthyostega
9aa3cc11e8
Veryfied the tests, cleaned up. TODO: concurrency, error checks and convienience shortcuts.
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/*
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BUILDERTOOL.hpp - Interface, (visiting) tool for processing MObjects
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Copyright (C) CinelerraCV
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2007, 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 MOBJECT_BUILDER_TOOL_H
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#define MOBJECT_BUILDER_TOOL_H
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#include "common/visitor.hpp"
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namespace mobject
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{
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class Buildable;
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namespace builder
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{
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/**
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* Policy invoking an catch-all function for processing
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* an unknown tool / target pair, effectively enforcing the
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* implementation of a catch-all function \c onUnknown(BASE&)
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*/
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template<class RET>
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class InvokeCatchAllFunction
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{
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protected:
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virtual ~InvokeCatchAllFunction() {}
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public:
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virtual RET onUnknown (Buildable& target) = 0;
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};
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/**
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* Base class of all BuilderTools, used according to the visitor pattern:
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* each Tool contains the concrete implementation for one task to be done
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* to the various MObject classes. The concrete builder tool implementation
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* should not diretcly inherit from this base interface, but rather through
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* an instantiation of the BuilderToolTag template. Additionally, it should
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* inherit from the Applicable template parametrized with all conctrete
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* Buildable classes, for which it wants calls to be dispatched.
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*/
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typedef cinelerra::visitor::Tool<void, InvokeCatchAllFunction> BuilderTool;
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template<class TOOLImpl>
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class BuilderToolTag
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: public cinelerra::visitor::ToolTag<TOOLImpl, BuilderTool>
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{ }
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;
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template
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< class TAR, // concrete Buildable to be treated
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class TOOLImpl // concrete BuilderTool implementation
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>
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class Applicable
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: public cinelerra::visitor::Applicable<TAR,TOOLImpl, BuilderTool>
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{ }
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;
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} // namespace mobject::builder
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/**
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* Marker Interface for classes Visitable by Builder tools.
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*/
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class Buildable : public cinelerra::visitor::Visitable<builder::BuilderTool>
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{ };
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} // namespace mobject
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#endif
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