s="keyword">const</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="identifier">construct_from_string</span><span class="special">&gt;&amp;)</span>
            <span class="special">{</span>
              <span class="identifier">constant_initializer</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="special">&amp;</span> <span class="ident