unary_expr</span></h2>
<p>boost::proto::unary_expr &#8212; A metafunction for generating unary expression types with a specified tag type,
          a grammar element for matching unary expressions, and
          a <a class="link" href="../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>
          that dispatches to the
          <code class="computeroutput"><a class="link" href="pass_through.html" title="Struct template pass_through">proto::pass_through&lt;&gt;</a></cod