From: Giovanni Piero Deretta (gpderetta_at_[hidden])
Date: 2007-05-24 10:00:17
On 5/24/07, Arkadiy Vertleyb <vertleyb_at_[hidden]> wrote:
> "Giovanni Piero Deretta" <gpderetta_at_[hidden]> wrote
>
> > This works though (at least with gcc 4.1.2):
> >
> > #include <vector>
> >
> > template<typename T>
> > struct identity {
> > typedef T type;
> > };
> >
> > int main() {
> > std::vector<int> v;
> > typedef identity<typeof(v)>::type::iterator type;
> > }
> >
> > So BOOST_TYPEOF could include 'identity' in its expansion.
>
> Working around the problem by _complicating_ the expression inside typeof is
> not a way I would go. It then may fail in another contexts, where it didn't
> fail before.
>
Agreed, In fact I said myself that the 'simple' solution could break
with more complex expressions.
> This is clearly a compiler bug, and needs to be addressed by the compiler
> developers.
>
Well, boost as plenty of workarounds for broken compilers, so I do not
think this matter much. Even if gcc developers fixthis, older releases
will be still broken.
Anyways, IIRC next release might support decltype, so the issue is moot.
gpd