pan class="identifier">mpfr_class</span></code> or
        <code class="computeroutput"><span class="identifier">mpreal</span></code> are then usable unchanged
        once this header is included, so for example <code class="computeroutput"><span class="identifier">mpfr_class</span></code>'s
        performance-enhancing expression templates are preserved and fully supported
        by this library:
      </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;