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  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;value() const &amp;</code></h1></div></div></div>
  <p>Wide contract const lvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>

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