"special">::</span><span class="identifier">convert_from_string</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="string">"3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651e+00"</span><span class="special">,</span>
               <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_convertible</span><span class="special">&lt;</span><sp