[libc++][test] Cleanup typos and unnecessary semicolons (#73435)

I've structured this into a series of commits for even easier reviewing,
if that helps. I could easily split this up into separate P

[libc++][test] Cleanup typos and unnecessary semicolons (#73435)

I've structured this into a series of commits for even easier reviewing,
if that helps. I could easily split this up into separate PRs if
desired, but as this is low-risk with simple edits, I thought one PR
would be easiest.

* Drop unnecessary semicolons after function definitions.
* Cleanup comment typos.
* Cleanup `static_assert` typos.
* Cleanup test code typos.
+ There should be no functional changes, assuming I've changed all
occurrences.
* ~~Fix massive test code typos.~~
+ This was a real problem, but needed more surgery. I reverted those
changes here, and @philnik777 is fixing this properly with #73444.
* clang-formatting as requested by the CI.

show more ...

[libc++][mdspan] Implement std::mdspan class

This implements P0009 std::mdspan ((https://wg21.link/p0009)),
a multidimensional span with customization points for
layouts and data access.

Co-authore

[libc++][mdspan] Implement std::mdspan class

This implements P0009 std::mdspan ((https://wg21.link/p0009)),
a multidimensional span with customization points for
layouts and data access.

Co-authored-by: Damien L-G <dalg24@gmail.com>

Differential Revision: https://reviews.llvm.org/154367

show more ...

[libc++][mdspan] Implement layout_right

This commit implements layout_right in support of C++23 mdspan
(https://wg21.link/p0009). layout_right is a layout mapping policy
whose index mapping correspo

[libc++][mdspan] Implement layout_right

This commit implements layout_right in support of C++23 mdspan
(https://wg21.link/p0009). layout_right is a layout mapping policy
whose index mapping corresponds to the memory layout of multidimensional
C-arrays, and is thus also referred to as the C-layout.

Co-authored-by: Damien L-G <dalg24@gmail.com>

Differential Revision: https://reviews.llvm.org/D151267

show more ...

[libcxx] Add mdspan/extents

This patch adds std::extents. extents is one of the core classes used by std::mdspan. It describes a multi-dimensional index space with a mix of compile time and runtime

[libcxx] Add mdspan/extents

This patch adds std::extents. extents is one of the core classes used by std::mdspan. It describes a multi-dimensional index space with a mix of compile time and runtime sizes. Furthermore, it is templated on the index type used to describe the multi-dimensional index space.

The class is designed to be highly optimizable in performance critical code sections, and is fully useable in constant expressions contexts.

Testing of this class tends to be somewhat combinatorical, due to the large number of possible corner cases involved in situations where we have both runtime and compile time extents. To add to this, the class is designed to be interoperable (in particular constructible) from arguments which only need to be convertible to the index_type, but are otherwise arbitrary user types. For a larger discussion on the design of this class refer to: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html

Co-authored-by: Damien L-G <dalg24@gmail.com>

Reviewed By: ldionne, #libc

Spies: libcxx-commits, H-G-Hristov, tschuett, philnik, arichardson, Mordante, crtrott

Differential Revision: https://reviews.llvm.org/D148067

show more ...