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<h2><span class="refentrytitle">Macro BOOST_VMD_ASSERT_IS_IDENTIFIER_D</span></h2>
<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>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="header/boost/vmd/assert_is_identifier_hpp.html" title="Header &lt;boost/vmd/assert_is_identifier.hpp&gt;">boost/vmd/assert_is_identifier.hpp</a>&gt;
</span>BOOST_VMD_ASSERT_IS_IDENTIFIER_D(d, ...)</pre></div>
<div class="refsect1">
<a name="idm45711066414352"></a><h2>Description</h2>
<p>The macro checks that the sequence is an identifier. If it is not an identifier, it forces a compiler error.</p>
<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>
<p>d = The next available BOOST_PP_WHILE iteration. <br>
... = variadic parameters</p>
<p>The variadic parameters are:</p>
<p>sequence = A sequence to test as an identifier. <br>
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>
<pre class="programlisting"><span class="identifier">returns</span> <span class="special">=</span> <span class="identifier">Normally</span> <span class="identifier">the</span> <span class="identifier">macro</span> <span class="identifier">returns</span> <span class="identifier">nothing</span><span class="special">.</span>
<span class="identifier">If</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">an</span> <span class="identifier">identifier</span><span class="special">,</span> <span class="identifier">nothing</span> <span class="identifier">is</span>
<span class="identifier">output</span><span class="special">.</span> <span class="identifier">If</span> <span class="identifier">optional</span> <span class="identifier">ids</span> <span class="identifier">are</span> <span class="identifier">specified</span><span class="special">,</span> <span class="keyword">for</span> <span class="identifier">the</span>
<span class="identifier">sequence</span> <span class="identifier">to</span> <span class="identifier">be</span> <span class="identifier">an</span> <span class="identifier">identifier</span> <span class="identifier">it</span> <span class="identifier">must</span> <span class="identifier">be</span> <span class="identifier">an</span>
<span class="identifier">identifier</span> <span class="identifier">that</span> <span class="identifier">matches</span> <span class="identifier">one</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">optional</span>
<span class="identifier">ids</span><span class="special">.</span>
<span class="identifier">For</span> <span class="identifier">VC</span><span class="special">++</span><span class="special">,</span> <span class="identifier">because</span> <span class="identifier">there</span> <span class="identifier">is</span> <span class="identifier">no</span> <span class="identifier">sure</span> <span class="identifier">way</span> <span class="identifier">of</span> <span class="identifier">forcing</span>
<span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">from</span> <span class="identifier">within</span> <span class="identifier">a</span> <span class="identifier">macro</span> <span class="identifier">without</span> <span class="identifier">producing</span>
<span class="identifier">output</span><span class="special">,</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">not</span> <span class="identifier">an</span> <span class="identifier">identifier</span> <span class="identifier">the</span>
<span class="identifier">macro</span> <span class="identifier">forces</span> <span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">by</span> <span class="identifier">outputting</span> <span class="identifier">invalid</span> <span class="identifier">C</span><span class="special">++</span><span class="special">.</span>
<span class="identifier">For</span> <span class="identifier">all</span> <span class="identifier">other</span> <span class="identifier">compilers</span> <span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">is</span> <span class="identifier">forced</span>
<span class="identifier">without</span> <span class="identifier">producing</span> <span class="identifier">output</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">not</span> <span class="identifier">an</span>
<span class="identifier">identifier</span><span class="special">.</span>
</pre>
<p>Identifiers are registered in VMD with:</p>
<pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_VMD_REG_XXX</span> <span class="special">(</span><span class="identifier">XXX</span><span class="special">)</span> <span class="identifier">where</span> <span class="identifier">XXX</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="identifier">v</span><span class="special">-</span><span class="identifier">identifier</span><span class="special">.</span>
</pre>
<p>The identifier must be registered to be found.</p>
<p>Identifiers are pre-detected in VMD with:</p>
<pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_VMD_DETECT_XXX_XXX</span> <span class="identifier">where</span> <span class="identifier">XXX</span> <span class="identifier">is</span> <span class="identifier">an</span> <span class="identifier">identifier</span><span class="special">.</span>
</pre>
<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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