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Implement P2474R2 views::repeat #3142

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merged 39 commits into from
Jan 28, 2023
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@SuperWig SuperWig commented Oct 4, 2022

Fixes #2933

Some questions:

  • Is the custom array list visualiser worth the novelty?
    • is it possible to use the value in the item name? My first thought for the iterators was to have it like [{_Current)] {Value}
  • What would be the right noexcept spec for the reconstruction stuff? I just left one as true
    • For that matter I'm not sure what the sensible way to test the noexceptness of the tuple overload.
  • Better name or methods for the noexcept testing helpers would be nice.
  • Any interesting views that is missing coverage?

Most of the test is reworked from the iota_view test, I might have removed something that should have been kept/reworked.

Drive-by fixed single_views visualizer, I'm assuming the intent was to wrap it in []

@SuperWig SuperWig requested a review from a team as a code owner October 4, 2022 14:16
@CaseyCarter CaseyCarter added the cxx23 C++23 feature label Oct 4, 2022
@CaseyCarter CaseyCarter added the ranges C++20/23 ranges label Oct 4, 2022
@strega-nil-ms strega-nil-ms self-assigned this Oct 4, 2022
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Thanks so much! Just some minor changes requested

thumbs up!

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Several functions should be unconditionally marked with noexcept, since operations on integer-like types are all noexcept, and the iterator is implemented as a trivially copyable type.

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SuperWig commented Oct 12, 2022

Just to be clear so I know where to pick up tomorrow when you lot (except a certain vampire) are probably asleep. The noexcept-ness shouldn't depend on the bound type at all?

Edit: oh, didn't see the "11 comments" button 😅.

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One internal constructor can't be unconditionally noexcept.

The noexcept-ness shouldn't depend on the bound type at all?

I think it does depend. But the permitted set of bound types is very small (only integer-like types and unreachable_sentinel_t), and noexcept-ness is always hold for its elements.

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@StephanTLavavej StephanTLavavej self-assigned this Jan 25, 2023
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@StephanTLavavej StephanTLavavej removed their assignment Jan 26, 2023
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Thanks! I pushed some minor changes (most notable being a slight expansion of death test coverage) and I believe that all outstanding comments have been resolved. Onwards to final review!

@CaseyCarter CaseyCarter self-requested a review January 27, 2023 00:37
@StephanTLavavej StephanTLavavej self-assigned this Jan 27, 2023
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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 1868694 into microsoft:main Jan 28, 2023
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Thanks! Thanks! Thanks! Thanks! Thanks! Thanks! Thanks! Thanks! Thanks! Thanks! 😹 😹 😹

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You can say that again.

@SuperWig SuperWig deleted the repeat branch January 28, 2023 08:17
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P2474R2 views::repeat
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