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<h2><span class="refentrytitle">Macro BOOST_VMD_ASSERT_IS_IDENTIFIER_D</span></h2>
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<p>BOOST_VMD_ASSERT_IS_IDENTIFIER_D — Asserts that the sequence is an identifier. Re-entrant version. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
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<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="header/boost/vmd/assert_is_identifier_hpp.html" title="Header <boost/vmd/assert_is_identifier.hpp>">boost/vmd/assert_is_identifier.hpp</a>>
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</span>BOOST_VMD_ASSERT_IS_IDENTIFIER_D(d, ...)</pre></div>
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<div class="refsect1">
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<a name="idm46213760619552"></a><h2>Description</h2>
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<p>The macro checks that the sequence is an identifier. If it is not an identifier, it forces a compiler error.</p>
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<p>The macro normally checks for an identifier only in debug mode. However an end-user can force the macro to check or not check by defining the macro BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.</p>
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<p>d = The next available BOOST_PP_WHILE iteration. ... = variadic parameters</p>
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<p>The variadic parameters are:</p>
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<p>sequence = A sequence to test as an identifier. ids (optional) = The data may take one of two forms: it is either one or more single identifiers or a single Boost PP tuple of identifiers.</p>
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<p>returns = Normally the macro returns nothing. If the sequence is an identifier, nothing is
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output. If optional ids are specified, for the
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sequence to be an identifier it must be an
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identifier that matches one of the optional
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ids.
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For VC++, because there is no sure way of forcing
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a compiler error from within a macro without producing
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output, if the sequence is not an identifier the
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macro forces a compiler error by outputting invalid C++.
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For all other compilers a compiler error is forced
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without producing output if the sequence is not an
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identifier.
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</p>
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<p>Identifiers are registered in VMD with: #define BOOST_VMD_REG_XXX (XXX) where XXX is a v-identifier.
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</p>
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<p>The identifier must be registered to be found.</p>
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<p>Identifiers are pre-detected in VMD with: #define BOOST_VMD_DETECT_XXX_XXX where XXX is an identifier.
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<p>If you specify optional ids and have not specified the detection of an optional id, that id will never match an identifier. </p>
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