iterator</span> <span class=identifier>project</span><span class=special>(</span><span class=identifier>IteratorType</span> <span class=identifier>it</span><span class=special>);</span>
  <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Tag</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>IteratorType</span><span class=special>&gt;</span>
    <span class=keyword>typename</span> <span class