id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
13,iterator_adapter and abstract classes,sielenk,david_abrahams,"{{{
Footnote [5] on the
Boost Iterator Adaptor Library
documentation page states that 
> The value_type of an iterator may not be
> an abstract base class, [...]
This is not true.

The value_type is only used as result type of operator[], so there ought to be no problem if the iterator is used as bidirectional and not as random access iterator.

The problem was caused by the structs
is_named_parameter and make_arg.

I changed
  is_convertible<Value,named_template_param_base>
to
  is_convertible<Value*,named_template_param_base*>
two times and everyting works beautifully,
i.e. the appended file compiles.

MfG Marvin H. Sielenkemper

}}}",Bugs,closed,,iterator,None,,Out of Date,,