Re: is_a<> with references

[Aldy Hernandez <aldyh@redhat.com>]

Issue resolved.  Typedef no longer needed.

Sorry for the noise.
Aldy

On Wed, Jun 1, 2022 at 4:29 PM Aldy Hernandez <aldyh@redhat.com> wrote:
>
> Hi folks.
>
> I rolled our own is_a<> implementation for vrange, because it was
> trivial.  We needed it to work on references, and GCC's is-a.h
> implementation is pointer-only. However, I now realize it confuses
> gengtype when adding additional types:
>
> template<typename T>
> struct vrange_traits
> {
>   // Default to something unusable.
>   typedef void range_type;
> };
>
> template<>
> struct vrange_traits<irange>
> {
>   typedef irange range_type;
> };
>
> template<>
> struct vrange_traits<frange>
> {
>   typedef frange range_type;  <-- BOO! HISS!
> };
>
> build/gengtype  \
>                     -S /home/aldyh/src/gcc/gcc -I gtyp-input.list -w
> tmp-gtype.state
> /home/aldyh/src/gcc/gcc/value-range.h:291: type `range_type' previously defined
> /home/aldyh/src/gcc/gcc/value-range.h:285: previously defined here
>
> Can some gengtype guru offer guidance?
>
> Thanks.
> Aldy