lass="keyword">typename</span> <span class="identifier">T</span>
    <span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">filter</span>
<span class="special">{</span>
    <span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
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<a name="fusion.algorithm.transformation.metafunctions.filter.t0"></a><p class="title