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75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
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/* Copyright (C) 2002
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* Housemarque Oy
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* http://www.housemarque.com
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*
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* Permission to copy, use, modify, sell and distribute this software is
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* granted provided this copyright notice appears in all copies. This
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* software is provided "as is" without express or implied warranty, and
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* with no claim as to its suitability for any purpose.
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*
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* See http://www.boost.org for most recent version.
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*/
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/* This example implements a generalized macro for 2D repetition using
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* the simple repetition primitives of the preprocessor library.
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*/
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#include <boost/preprocessor/repeat.hpp>
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#include <boost/preprocessor/repeat_2nd.hpp>
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/** Repeats the macro M(X,Y,P) for X = [0,W[ and Y = [0,H[.
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In other words, expands to the sequence:
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<PRE>\verbatim
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M( 0, 0, P) M( 1, 0, P) ... M(W-1, 0, P)
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M( 0, 1, P) M( 1, 1, P) ... M(W-1, 1, P)
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... ... ... ...
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M( 0,H-1, P) M( 1,H-1, P) ... M(W-1,H-1, P)
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\endverbatim</PRE>
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Uses BOOST_PP_REPEAT() and BOOST_PP_REPEAT_2ND().
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*/
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#define REPEAT_2D(W,H,M,P)\
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/* Here we must use BOOST_PP_REPEAT_2ND(), because\
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* we use BOOST_PP_REPEAT() in REPEAT_2D_ROW().\
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*/\
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BOOST_PP_REPEAT_2ND\
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( H\
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, REPEAT_2D_ROW\
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, (W,M,P)\
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)
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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#define REPEAT_2D_ROW(Y,WMP)\
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BOOST_PP_REPEAT\
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( BOOST_PP_TUPLE_ELEM(3,0,WMP)\
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, REPEAT_2D_ELEM\
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, (Y, BOOST_PP_TUPLE_ELEM(3,1,WMP), BOOST_PP_TUPLE_ELEM(3,2,WMP))\
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)
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#define REPEAT_2D_ELEM(X,YMP)\
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BOOST_PP_TUPLE_ELEM(3,1,YMP)\
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( X\
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, BOOST_PP_TUPLE_ELEM(3,0,YMP)\
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, BOOST_PP_TUPLE_ELEM(3,2,YMP)\
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)
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#endif
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#include <boost/preprocessor/logical/or.hpp>
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#include <boost/preprocessor/comma_if.hpp>
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#include <boost/preprocessor/list/cat.hpp>
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#include <boost/preprocessor/tuple/to_list.hpp>
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/* Here we use the above macro to generate something. */
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#define ELEM(X,Y,E) BOOST_PP_COMMA_IF(BOOST_PP_OR(X,Y)) BOOST_PP_LIST_CAT(BOOST_PP_TUPLE_TO_LIST(5,(E,_,X,_,Y)))
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enum { REPEAT_2D(3,4,ELEM,elem) };
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/* The above expands to:
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*
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* enum { elem_0_0, elem_1_0, elem_2_0,
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* elem_0_1, elem_1_1, elem_2_1,
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* elem_0_2, elem_1_2, elem_2_2,
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* elem_0_3, elem_1_3, elem_2_3 };
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*/
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