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| author | Xiaoyang Liu <siujoeng.lau@gmail.com> | 2024-04-12 13:25:22 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-04-12 19:25:22 +0200 |
| commit | 7cafe04e0d74c1e9f7e3871a0bcdf4ccb1c89f0c (patch) | |
| tree | 64933b581921230fe5fee6c06803f05c7110bd69 /llvm/unittests/Support/VirtualFileSystemTest.cpp | |
| parent | 6a85cf8fc0437d4885fc829948befe32c1e5a21d (diff) | |
| download | llvm-7cafe04e0d74c1e9f7e3871a0bcdf4ccb1c89f0c.zip llvm-7cafe04e0d74c1e9f7e3871a0bcdf4ccb1c89f0c.tar.gz llvm-7cafe04e0d74c1e9f7e3871a0bcdf4ccb1c89f0c.tar.bz2 | |
[libc++] P3029R1: Better `mdspan`'s CTAD (#87873)
## Abstract
This pull request implements [P3029R1](https://wg21.link/P3029R1). The
paper discusses the current behavior of `mdspan`'s most common
pointer-indices CTAD, where the `Extents` template parameter is deduced
as `dextents` (dynamic extents), even when passing compile-time constant
values. The author believes this behavior is suboptimal, as it doesn't
take advantage of the compile-time information. The proposed change
suggests deducing static extents if `integral_constant`-like constants
are passed, resulting in more intuitive syntax and less error-prone
code.
## Reference
- [P3029R1](https://wg21.link/P3029R1)
- [Draft C++ Standard: [span.syn]](https://eel.is/c++draft/span.syn)
- [Draft C++ Standard: [mdspan.syn]](https://eel.is/c++draft/mdspan.syn)
Diffstat (limited to 'llvm/unittests/Support/VirtualFileSystemTest.cpp')
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