ss="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Func<span class="special">&gt;</span> <a class="link" href="param_type.html#id-1_3_35_5_6_10_1_1_1_3_7-bb"><span class="identifier">param_type</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="keyword">double</span><span class="special">,</span> <span class="keyword">double<