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[SVN r15202]
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Paul Mensonides
2002-09-08 09:58:13 +00:00
parent ce2f5ccec1
commit 54d6f56c0e
106 changed files with 20 additions and 22261 deletions
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include/boost/preprocessor/expr_if.hpp
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#ifndef BOOST_PREPROCESSOR_EXPR_IF_HPP
#define BOOST_PREPROCESSOR_EXPR_IF_HPP
/* Copyright (C) 2002
* Housemarque Oy
* http://www.housemarque.com
*
* Permission to copy, use, modify, sell and distribute this software is
* granted provided this copyright notice appears in all copies. This
* software is provided "as is" without express or implied warranty, and
* with no claim as to its suitability for any purpose.
*
* See http://www.boost.org for most recent version.
*/
#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>
<p><code>COND</code> must expand to an integer literal in the range [0, BOOST_PP_LIMIT_MAG].</p>
<p>For example, <code>BOOST_PP_EXPR_IF(1,^)</code> expands to <code>^</code>.</p>
<h3>See</h3>
<ul>
<li>BOOST_PP_IF()</li>
</ul>
*/
#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
#endif