</a></span><a class="link" href="function_output.html#iterator.specialized.function_output.requirements">Requirements</a>
      </h4>
<p>
        <code class="computeroutput"><span class="identifier">UnaryFunction</span></code> must be Assignable
        and Copy Constructible.
      </p>
<h4>
<a name="iterator.specialized.function_output.h4"></a>
        <span class="phrase"><a name="iterator.specialized.function_output.concepts"></a></span><a class="link" href="function_output.html#iterator.specialized.fu