Structure binding support

[Matthias Moulin]

It would be nice to have C++17's structure binding support for StaticVector and StaticMatrix, where the former decomposes a StaticVectorinto scalars and the latter decomposes a StaticMatrix into row vectors.

This requires partially specializing std::tuple_size and std::tuple_element.

[Klaus Iglberger]

Hi Matthias!

This sounds like a reasonable addition to StaticVector and StaticMatrix. We will consider this in one of the next releases of Blaze. Alternatively, if you have the time, you could also provide the necessary specializations in form of a pull request. Thanks for creating this issue,

Best regards,

Klaus!

[Matthias Moulin]

Godbolt code: https://godbolt.org/z/ir22Nb

[Klaus Iglberger]

Commit a5c3942 adds structure binding support for the StaticVector class template. The feature is immediately available via cloning the Blaze repository and will be officially released in Blaze 3.6.

[Matthias Moulin]

I just noticed that a5c3942 will not work as-is:

• classuses private as default access modifier;
• structuses publicas default access modifier.

I also noticed (to my surprise) at https://en.cppreference.com/w/cpp/utility/tuple/tuple_size, that the template class uses class. So class is indeed the better choice for the partial template specializations.

[Klaus Iglberger]

Hi Matthias!

Commit 726f61e has already fixed this issue on August, 14th.

Best regards,

Klaus!

[Matthias Moulin]

Right, but then you need to make both the inheritance and member type alias public?

[Klaus Iglberger]

You are correct, commit 726f61e is incomplete, I apologize. Commit 6f7687b takes care of these problems.