class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Remark</span></dt>
<dd><p>
                      If <code class="computeroutput"><span class="identifier">element_type</span></code>
                      is a void type, the type of <code class="computeroutput"><span class="identifier">v</span></code>
                      is unspecified; otherwise, it is <code class="computeroutput"><span class="identifier">element_type</span><span class="special">&amp;</sp