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make _Get_unwrapped noexcept when possible #2991

Merged
merged 12 commits into from
Aug 16, 2022
Merged

make _Get_unwrapped noexcept when possible #2991

merged 12 commits into from
Aug 16, 2022

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strega-nil-ms
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@strega-nil-ms strega-nil-ms commented Aug 3, 2022 •
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additionally:

  • add _Unwrapped() && noexcept to path::iterator
  • add _Unwrapped() && to reverse_iterator
  • add conditional noexcepts to:
    • counted_iterator
    • take_view::_Sentinel
    • take_while_view::_Sentinel
    • move_iterator

Fixes #2989

Requires testing

@strega-nil
make _Get_unwrapped noexcept when possible
36fcea2 
additionally, add conditional noexcepts to a lot of `_Unwrapped()`s
@StephanTLavavej StephanTLavavej added the enhancement Something can be improved label Aug 3, 2022
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CaseyCarter commented Aug 3, 2022 •
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I want to say that path::iterator::_Unwrapped should be rvalue-qualified and noexcept, which is consistent with the design to support unwrapping move-only input iterators, but then they couldn't be sentinels. Sentinels and forward iterators must support non-modifying lvalue unwrap. (As if I needed another reason to hate path::iterator.)

We should consider adding a _Unwrapped() && noexcept for perf.

@strega-nil-ms strega-nil-ms marked this pull request as ready for review August 5, 2022 18:49
@strega-nil-ms strega-nil-ms requested a review from a team as a code owner August 5, 2022 18:49
@strega-nil
moar testing
e53cbba 
plus, fix reverse_iterator up with an `_Unwrapped() &&`
@strega-nil-ms strega-nil-ms mentioned this pull request Aug 5, 2022
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@strega-nil strega-nil mentioned this pull request Aug 6, 2022
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CaseyCarter
CaseyCarter requested changes Aug 6, 2022
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strega-nil-ms pushed a commit to miscco/STL that referenced this pull request Aug 12, 2022
@strega-nil
make clean merge with microsoft#2991
561cd62
@StephanTLavavej StephanTLavavej self-assigned this Aug 16, 2022
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

@StephanTLavavej StephanTLavavej merged commit ebbc990 into microsoft:main Aug 16, 2022
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Thanks for this PR - let's call it a wrap! 😹 🎁 🎥

@strega-nil-ms strega-nil-ms deleted the is_nothrow_unwrapped branch December 19, 2022 23:42
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_Get_unwrapped et. al. should (almost) always be noexcept
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@strega-nil-ms @CaseyCarter @StephanTLavavej @strega-nil
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