isting"><span class="comment">//import both calculate functions</span>
<span class="keyword">auto</span> <span class="identifier">calc_f</span> <span class="special">=</span> <span class="identifier">lib</span><span class="special">.</span><span class="identifier">get_mem_fn</span><span class="special">&lt;</span><span class="identifier">alias</span><span class="special">,</span> <span class="keyword">float</span><span class="special">(</span><span class="keyword">float</span><span class="special">,</span> 