transform_iterator does not mention all implemented operators

<URL: 
http://www.boost.org/doc/libs/1_47_0/libs/iterator/doc/transform_iterator.html 
>

>From reading the documentation, it is not clear how operators like operator 
!= apply to transform_iterator.  The synopsis does not say it inherits from 
anything.  For the operators to work, it should inherit from 
iterator_adaptor.

Note that iterator_adaptor is described as derived from iterator_facade, as 
it should be.