&lt;T,
    U&gt;</a></code>, <code><a href="#dividable2_left">dividable2_left&lt;T,
    U&gt;</a></code>, <code><a href="#modable2_left">modable2_left&lt;T,
    U&gt;</a></code>) that define the signatures for non-commutative
    operators where <code>U</code> appears on the left hand side
    (<code>operator-(const U&amp;, const T&amp;)</code>,
    <code>operator/(const U&amp;, const T&amp;)</code>, <code>operator%(const
    U&amp;, const T&amp;)</code>).</p>

    <p>With respect to the performance observe