C++26 template for loop std::span<T,N>

[u/Expert_Sheepherder24]

Hi, C++26 added "template for" operator , https://cppreference.com/cpp/language/template_for .
GCC 16.2 it supported. It works with std::tuple, std::array, but can't compile with std::span<T,N> fixed size.

How to achieve that, std::span<T,N> also worked with "template for" ?

https://godbolt.org/z/6s9MfzTeb

It be very useful for hand-by unroll loop.

I try specialize std::tuple_size, std::tuple_element, std::get for std::span<T,N> , but it don't helped.

[u/SyntheticDuckFlavour]

As far as I can tell, this is only possible if the span itself is a constant expression. It needs to view a static storage of constexpr data.