>double</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">estimate_polynomial_roots</span><span class="special">(</span>
  <span class="identifier">random_generator_t</span><span class="special">&amp;</span> <span class="identifier">gen</span><span class="special">,</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">function</span><span class="special">&lt;</span><span class="key