From: Dan Nuffer (dnuffer_at_[hidden])
Date: 2000-11-03 14:29:34
Dan Nuffer wrote:
>
> Darin Adler wrote:
> >
> > on 11/3/00 10:10 AM, Dan Nuffer at dnuffer_at_[hidden] wrote:
> >
> > > Also, I am using gcc 2.95.2 on Caldera OpenLinux 2.4 and any_cast wouldn't
> > > compile. gcc was giving the following warning:
> > >
> > > src/tokenizer/any.hpp:179: parse error before `>'
> > >
> > > It didn't like the to_ptr<ValueType> for some strange reason. It
> > > normally accepts this syntax...
> > > To get around the problem I had to add a little template helper:
> > >
> > > template <typename ValueType>
> > > const ValueType * to_ptr_helper( ValueType* ) const
> > > {
> > > return const_cast<any *>(this)->to_ptr<ValueType>();
> > > }
> >
After fiddling around some more, I found an even better way to get g++
to compile this.
There is no need for to_ptr_helper, simply change any_cast like this:
template<typename ValueType>
ValueType any_cast(const any & operand)
{
const ValueType * result =
operand.template to_ptr<ValueType>();
if(!result)
{
throw bad_any_cast();
}
return *result;
}
Adding "template" in the middle of "operand.to_ptr" looks strange, but
it's valid and helps g++ parse it correctly.
--Dan Nuffer