al/lambda-expression.html" target="_top">MPL
                      Lambda Expression</a>
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                    <p>
                      Remove elements which evaluate to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
                    </p>
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