ifier">constant_pi</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">get_from_string</span> <span class="special">&gt;::</span><span class="identifier">do_nothing</span><span class="special">();</span>
              <span class="keyword">return</span> <span class="identifier">get_from_string</span><span class="special">();</span>
            <span class="special">}</span>
            <span class="comment">// Float, double and 