e,
                                                                   typename type_traits&lt;typename promote_traits&lt;typename E1::value_type,
                                                                                                                typename E2::value_type&gt;::promote_type&gt;::precision_type&gt; &gt;::result_type
    prec_inner_prod (const vector_expression&lt;E1&gt; &amp;e1,
                     const vector_expression&lt;E2&gt; &amp;e2);</code>
</pre>
<h4>Description</h4>
<p><co