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[SVN r12400]
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Vesa Karvonen
2002-01-21 19:21:24 +00:00
parent e1af246b06
commit e562e2478b
1 changed files with 14 additions and 1 deletions
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15
include/boost/preprocessor/for.hpp
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@ -48,7 +48,20 @@ BOOST_PP_FOR##R() directly. For each macro implemented using BOOST_PP_FOR(),
there is a version of the macro, distinguished by the _R suffix, that accepts
an additional recursion depth as the first parameter. This technique is
necessary to avoid recursively expanding the same macro again, which is not
permitted by the C/C++ preprocessor.
permitted by the C++ preprocessor.
<H3>BOOST_PP_REPEAT() vs BOOST_PP_FOR()</H3>
BOOST_PP_FOR() is a generalization of BOOST_PP_REPEAT(). This means that
BOOST_PP_REPEAT() can be implemented using BOOST_PP_FOR(). Unfortunately,
BOOST_PP_FOR() is slower than BOOST_PP_REPEAT(). In addition,
BOOST_PP_REPEAT() was introduced earlier, is generally easier to use, and is
still quite useful on its own.
<H3>2D and 3D repetition</H3>
BOOST_PP_FOR() can be used for multidimensional repetition simply by invoking
BOOST_PP_FOR##R() directly.
*/
#define BOOST_PP_FOR(X,C,F,I) BOOST_PP_FOR0(X,C,F,I)