word">typename</span> Func<span class="special">&gt;</span> 
  <a name="id-1_3_35_5_6_10_1_1_1_3_7-bb"></a><span class="identifier">param_type</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> nw<span class="special">,</span> <span class="keyword">double</span> xmin<span class="special">,</span> <span class="keyword">double</span> xmax<span class="special">,</span> <span class="identifier">Func</span> fw<span class="s