span class="identifier">N</span><span class="special">,</span> <span class="special">&amp;</span> <span class="identifier">constant_pi</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">template</span> <span class="identifier">compute</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">do_nothing</span><span class="spe