l">::</span><span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">mp</span><span class="special">::</span><span class="identifier">mpfr_float_backend</span><span class="special">&lt;</span><span class="number">300</span><span class="special">&gt;</span> <span class="special">&gt;</span>  <span class="identifier">my_float</span><span class="special">;</span>

<span class="identifier">my_float</span> <span class="identifier">a</span><span class="special">,</span> <spa