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reinserted delay macros

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[SVN r14171]
This commit is contained in:
Paul Mensonides
2002-06-18 21:54:30 +00:00
parent 6a7259a48d
commit 37f823fd4a
3 changed files with 21 additions and 8 deletions
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9
include/boost/preprocessor/expr_if.hpp
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@ -13,7 +13,9 @@
* See http://www.boost.org for most recent version.
*/
#include <boost/preprocessor/detail/cat.hpp>
// pm: not necessary if using manual delay
// #include <boost/preprocessor/detail/cat.hpp>
#include <boost/preprocessor/logical/bool.hpp>
/** <p>Expands to <code>EXPR</code> if <code>COND != 0</code> and to nothing if <code>COND == 0</code>.</p>
@ -27,7 +29,10 @@
<li>BOOST_PP_IF()</li>
</ul>
*/
#define BOOST_PP_EXPR_IF(COND,EXPR) BOOST_PP_DETAIL_CAT2(BOOST_PP_EXPR_IF,BOOST_PP_BOOL(COND))(EXPR)
#define BOOST_PP_EXPR_IF(COND,EXPR) BOOST_PP_EXPR_IF_BOOL(BOOST_PP_BOOL(COND),EXPR) // original: BOOST_PP_DETAIL_CAT2(BOOST_PP_EXPR_IF,BOOST_PP_BOOL(COND))(EXPR)
#define BOOST_PP_EXPR_IF_BOOL(COND,EXPR) BOOST_PP_EXPR_IF_BOOL_DELAY(COND,EXPR)
#define BOOST_PP_EXPR_IF_BOOL_DELAY(COND,EXPR) BOOST_PP_EXPR_IF##COND(EXPR)
#define BOOST_PP_EXPR_IF0(E)
#define BOOST_PP_EXPR_IF1(E) E