63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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vcall.h - helper macros for virtual (method) calls in C
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Copyright (C) Lumiera.org
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2010, Christian Thaeter <ct@pipapo.org>
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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
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the 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 LUMIERA_VCALL_H
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#define LUMIERA_VCALL_H
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#include <nobug.h>
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/**
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* @file
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* This allows one to do polymorphic programming in C by referencing a vtable
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* member which contains function pointers to a structure and then calling
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* this 'virtual' functions through the VCALL macro.
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*/
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/*
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TODO usage example, see btree.h
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*/
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/**
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* helper macro for calling vtable functions
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* just adds syntacic sugar VCALL(obj, func, params...)
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* translates to obj->vtable->func(obj, params...) plus some saftey checks
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*/
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#define LUMIERA_VCALL(self, function, ...) \
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({ \
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REQUIRE (self); \
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REQUIRE (self->vtable->function); \
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self->vtable->function (self, ## __VA_ARGS__); \
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})
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#ifndef VCALL
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#define VCALL LUMIERA_VCALL
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#else
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#error "WTF! someone defined VCALL!"
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#endif
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#endif
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/*
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// Local Variables:
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// mode: C
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// c-file-style: "gnu"
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// indent-tabs-mode: nil
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// End:
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*/
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