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- <title>BOOST_PP_IS_BEGIN_PARENS</title>
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- <div style="margin-left: 0px;"> The <b>BOOST_PP_IS_BEGIN_PAREN</b>S
- determines whether the input starts with a set of parenthesis.</div>
- <h4>Usage</h4>
- <div class="code"> <b>BOOST_PP_IS_BEGIN_PARENS</b>(...) <a href="../topics/variadic_macros.html#VNotation"
- target="_self"><sup>(v)</sup></a></div>
- <h4>Arguments</h4>
- <h4> ... <span style="font-weight: normal;">
- The input as variadic data.</span></h4>
- <h4>Remarks</h4>
- <div> If the input input begins with a parenthesis, with any data within
- that parenthesis, the macro returns 1, otherwise it returns 0. Data may
- follow the beginning parenthesis and the macro still will return 1.<br>
- <br>
- For Visual Studio 2005 ( VC8 ) the input data must be a single parameter
- else a compilation error will occur.</div>
- <h4>See Also</h4>
- <ul>
- <li><a href="remove_parens.html">BOOST_PP_REMOVE_PARENS</a></li>
- </ul>
- <h4>Requirements</h4>
- <div> <b>Header:</b> <a href="../headers/punctuation/is_begin_parens.html"><boost/preprocessor/punctuation/is_begin_parens.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div>
- <pre>#include <<a href="../headers/punctuation/is_begin_parens.html">boost/preprocessor/punctuation/is_begin_parens.hpp</a>>
- #define VARDATA more_data , more_params<br>#define VARDATAP ( data ) more_data , more_params<br>#define DATA data<br>#define DATAP ( data ) more_data<br>
- BOOST_PP_IS_BEGIN_PARENS(VARDATA) // expands to 0, compiler error with VC8
- BOOST_PP_IS_BEGIN_PARENS(VARDATAP) // expands to 1, compiler error with VC8<br><br>BOOST_PP_IS_BEGIN_PARENS(DATA) // expands to 0
- BOOST_PP_IS_BEGIN_PARENS(DATAP) // expands to 1<br><br>BOOST_PP_IS_BEGIN_PARENS() // expands to 0<br>
- </pre></div>
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- <div style="margin-left: 0px;"> <i>© Copyright Edward Diener 2014</i> </div>
- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
- or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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