2002-10-03 22:13:37 +00:00
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<html>
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<head>
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<title>BOOST_PP_LPAREN</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_LPAREN</b> macro expands to a left parenthesis.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_LPAREN</b>()
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</div>
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<h4>Remarks</h4>
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<div>
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The preprocessor interprets parentheses as delimiters in macro invocations.
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Because of this, parentheses require special handling.
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="rparen.html">BOOST_PP_RPAREN</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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2004-10-11 06:58:45 +00:00
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<b>Header:</b> <a href="../headers/punctuation/paren.html"><boost/preprocessor/punctuation/paren.hpp></a>
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2002-10-03 22:13:37 +00:00
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</div>
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<h4>Sample Code</h4>
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<div><pre>
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2004-10-11 06:58:45 +00:00
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#include <<a href="../headers/punctuation/paren.html">boost/preprocessor/punctuation/paren.hpp</a>>
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2002-10-03 22:13:37 +00:00
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#define X(x) x
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#define MACRO(p, x) X p x )
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MACRO(<a href="lparen.html">BOOST_PP_LPAREN</a>(), abc) // expands to abc
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#define Y(x)
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MACRO((10) Y <a href="lparen.html">BOOST_PP_LPAREN</a>(), result) // expands to 10
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</pre></div>
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</body>
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</html>
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