n><span class="identifier">event_composer_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> composer<span class="special">)</span><span class="special">;</span></pre>
<p>The method installs the function object that extracts event identifier from the attributes and creates insertion strings that will replace placeholders in the event message. </p>
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</ol></div>
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<div class="refsect2">
<a name="idm67270"></a><h3>
<a name="idm32638-bb"></a><code class="computeroutput">