boost_preprocessor/include/boost/preprocessor/comma_if.hpp

#ifndef BOOST_PREPROCESSOR_COMMA_IF_HPP
#define BOOST_PREPROCESSOR_COMMA_IF_HPP

/* Copyright (C) 2001
 * 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/comma.hpp>
#include <boost/preprocessor/empty.hpp>
#include <boost/preprocessor/if.hpp>

/** <p>Expands to a comma if <code>COND != 0</code> and nothing if
<code>COND == 0</code>.</p>

<p><code>COND</code> must expand to an integer literal.</p>

<p>For example, <code>BOOST_PP_COMMA_IF(0)</code> expands to nothing.</p>
*/
#define BOOST_PP_COMMA_IF(COND) BOOST_PP_IF(COND,BOOST_PP_COMMA,BOOST_PP_EMPTY)()

/** <p>Obsolete. Use BOOST_PP_COMMA_IF().</p> */
#define BOOST_PREPROCESSOR_COMMA_IF(C) BOOST_PP_COMMA_IF(C)
#endif