tor</code>
equivalent to <code>it</code>.<br>
<b>Complexity:</b> Constant.<br>
<b>Exception safety:</b> <code>nothrow</code>.
</blockquote>

<code>template&lt;typename Tag,typename IteratorType><br>
typename index&lt;Tag>::type::const_iterator project(IteratorType it)const;</code>

<blockquote>
<b>Requires:</b> <code>Tag</code> is such that
<code>index&lt;Tag>::type</code> is valid. <code>IteratorType</code>
belongs to <code>const_iterator_type_list</code> or
<code>iterator_type_list</code>. <code>it</code>