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	<title>control/expr_if.hpp</title>
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		The <b>control/expr_if.hpp</b> header defines a macro that expands to an expression selectively.
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	<h4>Usage</h4>
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			#include <b>&lt;boost/preprocessor/control/expr_if.hpp&gt;</b>
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	<h4>Contents</h4>
		<ul>
			<li><a href="../../ref/expr_if.html">BOOST_PP_EXPR_IF</a></li>
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