973348fdb8
Added a header for generalized preprocessor idioms. This will grow over time, as needed things will be added.
84 lines
3.3 KiB
C
84 lines
3.3 KiB
C
/*
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ppmpl.h - preprocessor meta programming library
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Copyright (C) Lumiera.org
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2008, 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 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 PPMPL_H
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#define PPMPL_H
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/**
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* @file
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* Preprocessor metaprogramming library. We define some useful preprocessor
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* tricks here.
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*/
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/**
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* Iterate over a list of macros.
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* @param p used to disambiguate up to three passes, use _, _P1_ or _P2_
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* @param ... list of macros to be expanded. The user has to supply a definition
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* in the form of PPMPL_FOREACH##p##macroname which shall expand to the desired text.
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*
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* This user defined macro shall be undefed after use.
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*
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* @example
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* #define PPMPL_FOREACH_P1_FOO(arg) arg,
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*
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* {PPMPL_FOREACH(P1, FOO(1), FOO(2), FOO(3)), -1}
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*
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* #undef PPMPL_FOREACH_P1_FOO
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*
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* Would expand to the sequence:
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* {1, 2, 3, -1}
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*/
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#define PPMPL_FOREACH(p, ...) PPMPL_FOREACH0(p, __VA_ARGS__, PPMPL_FOREACH_NIL))
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/* internal */
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#define PPMPL_FOREACH0(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH1(p, __VA_ARGS__)
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#define PPMPL_FOREACH1(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH2(p, __VA_ARGS__)
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#define PPMPL_FOREACH2(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH3(p, __VA_ARGS__)
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#define PPMPL_FOREACH3(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH4(p, __VA_ARGS__)
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#define PPMPL_FOREACH4(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH5(p, __VA_ARGS__)
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#define PPMPL_FOREACH5(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH6(p, __VA_ARGS__)
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#define PPMPL_FOREACH6(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH7(p, __VA_ARGS__)
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#define PPMPL_FOREACH7(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH8(p, __VA_ARGS__)
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#define PPMPL_FOREACH8(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH9(p, __VA_ARGS__)
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#define PPMPL_FOREACH9(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH10(p, __VA_ARGS__)
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#define PPMPL_FOREACH10(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH11(p, __VA_ARGS__)
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#define PPMPL_FOREACH11(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH12(p, __VA_ARGS__)
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#define PPMPL_FOREACH12(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH13(p, __VA_ARGS__)
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#define PPMPL_FOREACH13(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH14(p, __VA_ARGS__)
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#define PPMPL_FOREACH14(p, h, ...) PPMPL_FOREACH##p##h PPMPL_FOREACH15(p, __VA_ARGS__)
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#define PPMPL_FOREACH15(p, h, ...) PPMPL_FOREACH##p##h
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#define PPMPL_FOREACH_
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#define PPMPL_FOREACH_P1_
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#define PPMPL_FOREACH_P2_
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#define PPMPL_FOREACH_PPMPL_FOREACH_NIL PPMPL_FOREACH_FINAL(
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#define PPMPL_FOREACH_P1_PPMPL_FOREACH_NIL PPMPL_FOREACH_FINAL(
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#define PPMPL_FOREACH_P2_PPMPL_FOREACH_NIL PPMPL_FOREACH_FINAL(
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#define PPMPL_FOREACH_FINAL(...)
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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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