As a C++ programmer, I&#x27;d like to ask how is this different in effect from<p><pre><code>    template&lt;typename T, std::size_t X, std::size_t Y&gt;
    std::array&lt;T, X + Y&gt; app(std::array&lt;T, X&gt;, std::array&lt;T, Y&gt;);</code></pre>