lass="special">&gt;</span>  <span class="comment">// Defines the Backend type that wraps MPFR</span>

<span class="keyword">namespace</span> <span class="identifier">mp</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">multiprecision</span><span class="special">;</span>     <span class="comment">// Reduce the typing a bit later...</span>

<span class="keyword">typedef</span> <span class="identifier">mp</span><span class="specia