an class="identifier">U</span> <span class="keyword">const</span> <span class="special">&amp;</span> right<span class="special">,</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre></li>
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