 or function object.
	</td>
</tr>
<tr>
	<td valign="top"><tt><nobr>first_argument_type</nobr></tt>
	</td>
	<td valign="top">The type of the first argument to the function or function object.
	</td>
</tr>
<tr>
	<td valign="top"><tt><nobr>second_argument_type</nobr></tt>
	</td>
	<td valign="top">The type of the second argument to the function or function object.
	</td>
</tr>
</table>

<h3>Usage</h3>

<p><tt><nobr>unary_traits</nobr></tt> should be instantiated with
either a function taking a single parameter,