Implement P2440R1 ranges::iota, ranges::shift_left, ranges::shift_right #2580
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Welcome to the STL and thanks for the contribution.
This PR has already a lot of things in place. That is awesome for a first contribution!
Unfortunately, we have to completely rework the algorithms themselfs to provide the guarantees from the standard.
If you have any further questions on how to do this ask away.
| #error __cpp_lib_shift is not defined | ||
| #elif __cpp_lib_shift != 202202L | ||
| #if __cpp_lib_shift == 201806L | ||
| #error __cpp_lib_shift is 201806L when it should be 202202L |
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No change requested (mentioning for other reviewers): I observe that this is "new" (not strictly following the existing pattern), but it's reasonable to emit a more helpful diagnostic if this ever happens. Thanks!
tests/std/tests/VSO_0157762_feature_test_macros/test.compile.pass.cpp
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| if constexpr (_Is_sized) { | ||
| if (_Size < 2 * _Pos_to_shift) { | ||
| return {_Buf, _Move_n_helper(_First, _Size - _Pos_to_shift, _Buf)}; | ||
| } | ||
| } |
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No change requested: I observe that this if constexpr (_Is_sized) could be fused into the previous or the following if constexpr (_Is_sized) (and the following one comments about this _Size < 2 * _Pos_to_shift test). However, I see an argument for splitting them up this way, so that the previous and the following conditions are narrowly focused on advancing _Buf and _Lead, so this is fine as-is.
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
StephanTLavavej
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Thanks and congratulations for implementing this significant C++23 feature! 🎉 😻 🚀 This will ship in VS 2022 17.4 Preview 1. |
…ht (microsoft#2580) Co-authored-by: Casey Carter <Casey@Carter.net> Co-authored-by: Stephan T. Lavavej <stl@nuwen.net>
Fixes #2537