Matthias Kretz [Friday, 24 October 2025, 14:04:16 CEST]:
> > > > #endif // __glibcxx_integer_sequence
> > >
> > > This is defined for C++14 and later, but I think it can't actually be
> > > used for anything useful without C++26 packs introduced by structured
> > > bindings, right?
> > >
> > > I wonder if we want to restrict the definition of _IndexPack to C++26?
> >
> > I have defined my inital patch under #if __cpp_structured_bindings >=
> > 202411L,
> > i.e. auto [...ids] = is supported by the compiler, and I think this is the
> > right condition.
> > If this functionality will be made available as extension in previous
> > standard, _IndexPack
> > will also be useful.
>
> My thinking was that this simple tool itself doesn't require C++26. You can
> also use it like this:
>
> for (int i : _IndexPack<10>) { ... }
That said, it's incorrectly named. It really is an iota object or an index
array. So _Iota<N> or _IndexArray<N>?
- Matthias
> So it can be useful even without __cpp_structured_bindings >= 202411L. But
> I'm happy either way, since I only need it in [simd]. ;-)
>
> - Matthias
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Dr. Matthias Kretz https://mattkretz.github.io
GSI Helmholtz Center for Heavy Ion Research https://gsi.de
std::simd
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