uality_comparable1&lt;T&gt;</code></td>

        <td><code>bool operator!=(const T&amp;, const T&amp;)</code></td>

        <td><code>t == t1</code>.<br>
         Return convertible to <code>bool</code>.</td>
      </tr>

      <tr>
        <td><code><a name="equality_comparable2">equality_comparable&lt;T,
        U&gt;</a></code><br>
         <code>equality_comparable2&lt;T, U&gt;</code></td>

        <td><code>bool operator==(const U&amp;, const T&amp;)</code><br>
         <code>bool operator!=(const U&am