forked from boostorg/preprocessor
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* 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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/** <p>Repeats the macro <code>M(X,Y,DATA)</code> for <code>X = [0,W)</code> and <code>Y = [0,H)</code>.</p>
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<p>In other words, expands to the sequence:</p>
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<pre>
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M( 0, 0, DATA) M( 1, 0, DATA) ... M(W-1, 0, DATA)
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M( 0, 1, DATA) M( 1, 1, DATA) ... M(W-1, 1, DATA)
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... ... ... ...
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M( 0,H-1, DATA) M( 1,H-1, DATA) ... M(W-1,H-1, DATA)
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</pre>
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*/
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#define REPEAT_2D(W,H,M,DATA)\
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/* Here we can simply use BOOST_PP_REPEAT(), because\
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* it implements automatic recursion.\
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*/\
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BOOST_PP_REPEAT\
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( H\
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, REPEAT_2D_ROW\
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, (W,M,DATA)\
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)
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#define REPEAT_2D_ROW(Y,WMD)\
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BOOST_PP_REPEAT\
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( BOOST_PP_TUPLE_ELEM(3,0,WMD)\
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, REPEAT_2D_ELEM\
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, (Y, BOOST_PP_TUPLE_ELEM(3,1,WMD), BOOST_PP_TUPLE_ELEM(3,2,WMD))\
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)
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#define REPEAT_2D_ELEM(X,YMD)\
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BOOST_PP_TUPLE_ELEM(3,1,YMD)\
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( X\
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, BOOST_PP_TUPLE_ELEM(3,0,YMD)\
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, BOOST_PP_TUPLE_ELEM(3,2,YMD)\
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)
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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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