[Interest] Strange problem in template class (Iterator as value type of a QHash)

[Mandeep Sandhu]

>
>
> Error from Clang:
>
>  error: template argument for template type parameter must be a type; did
> you forget 'typename'?
>

It' right, in that I need to use typename 'somewhere', I just didn't know
where (and why).

I finally fixed it doing a typedef of this dependent type, which also makes
it easy to type! :)


template <typename K, typename V>
class TemplateTest
{
    typedef typename QLinkedList<V>::iterator iter;

public:
    TemplateTest()
    {
        QHash<K, iter > h;
        Q_UNUSED(h);
    }
...

There's a nice explanation about 'typename' keyword here:
http://pages.cs.wisc.edu/~driscoll/typename.html


> Note: use proper compiler next time.
>

Note:  Using g++, which is a _very_ proper compiler. It even has a
"-pedantic" switch! ;)

$ g++ --version
g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3

Regards,
-mandeep


>
> > Error:
> >
> > templatetest.h:13: error: type/value mismatch at argument 2 in template
> parameter list for 'template<class Key, class T> class QHash'
> > templatetest.h:13: error:   expected a type, got
> 'QLinkedList<V>::iterator'
> > templatetest.h:13: error: invalid type in declaration before ';' token
> >
> > However, if I keep the value as a QList (remove iterator) it compile
> fine.
> >
> > Whats the problem with storing a Iterator as the value?
> >
> > Thanks,
> > -mandeep
> >
> > ,
> > _______________________________________________
> > Interest mailing list
> > Interest at qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/interest
>
>
> --
> Regards,
> Konstantin
>
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