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<title>Struct template one_or_default</title>
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<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../accumulators/reference.html#header.boost.accumulators.numeric.functional_hpp" title="Header <boost/accumulators/numeric/functional.hpp>">boost/accumulators/numeric/functional.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span>
-<span class="keyword">struct</span> <a class="link" href="one_or_default.html" title="Struct template one_or_default">one_or_default</a> <span class="special">{</span>
+<span class="keyword">struct</span> <a class="link" href="one_or_default.html" title="Struct template one_or_default">one_or_default</a> <span class="special">:</span>
+ <span class="keyword">public</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">::</span><span class="identifier">type</span><span class="special"><</span> <span class="identifier">is_empty</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span><span class="special">,</span> <span class="identifier">default_</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span><span class="special">,</span> <span class="identifier">one</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">></span>
+<span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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