That looks neat! I think the second example seems like an argument for something where instead of the N being part of the visible type it's part of the traits vtable: maybe associated consts in trait impls?
@mrx Could you provide either a reference to or an example of creating an using a built-in C++ matrix type? An implementation of a native matrix in C++ could inform potential design for one in Rust.
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Funny story. mdarray is on the way to make into the C++ standard. It is a multi-dimensional array.
The reference: mdarray: An Owning Multidimensional Array Analog of mdspan
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