tually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>

<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>

<p><em>Requires</em>: Always available.</p>

<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>

<p><em>Guarantees</em>: An exception is never thrown.</p>


        </div><p><small>Last revised: February 12, 2019 at 16:36: