><span class="identifier">T</span></code> is a <code class="computeroutput"><span class="identifier">number</span></code>, then this expression is evaluated
      <span class="emphasis"><em>without creating a single temporary value</em></span>. In contrast,
      if we were using the <a href="http://math.berkeley.edu/~wilken/code/gmpfrxx/" target="_top">mpfr_class</a>
      C++ wrapper for <a href="http://www.mpfr.org" target="_top">MPFR</a> - then this expression
      would result in no less than 11 tempo