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Implement LWG-3717 common_view::end should improve random_access_range case #3266

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merged 3 commits into from
Dec 6, 2022
Merged

Implement LWG-3717 common_view::end should improve random_access_range case #3266

merged 3 commits into from
Dec 6, 2022

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frederick-vs-ja
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Fixes #3221.

Perhaps "random access iterators that only work with its difference type" is useful for conformance test and can be used elsewhere....

@frederick-vs-ja frederick-vs-ja requested a review from a team as a code owner December 5, 2022 17:04
@strega-nil-ms
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/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

@strega-nil-ms
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That was a weird error - looks like the boost-math submodule wasn't checked out.

@StephanTLavavej StephanTLavavej added the LWG Library Working Group issue label Dec 5, 2022
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Looking at the logs for the initial failed test run, I see that "Checkout boost-math source" was displayed as successful, but actually logged:

error: No such remote 'boostorg'
fatal: protocol error: bad pack header
fatal: ambiguous argument 'FETCH_HEAD': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
Finishing: Checkout boost-math source

This also affected the LLVM and google/benchmark submodule checkouts, but the microsoft/STL repo checkout succeeded. I'm not sure what could have caused this, especially with how each of the 8 VMs experienced the same thing.

StephanTLavavej
StephanTLavavej approved these changes Dec 5, 2022
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tests/std/tests/P0896R4_views_common/test.cpp
Comment on lines +394 to +395
friend constexpr bool operator==(difference_type_only_iterator, difference_type_only_iterator) = default;
friend constexpr auto operator<=>(difference_type_only_iterator, difference_type_only_iterator) = default;
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No change requested: This is correct, but defaulting just the spaceship would be sufficient. This is WG21-N4917 [class.compare.default]/4.

tests/std/tests/P0896R4_views_common/test.cpp
friend constexpr auto operator<=>(difference_type_only_iterator, difference_type_only_iterator) = default;

using iterator_concept = contiguous_iterator_tag;
using value_type = remove_cvref_t<T>;
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No change requested: After static_assert(is_object_v<T>) which forbids references, it would be sufficient to say remove_cv_t<T>.

@StephanTLavavej StephanTLavavej self-assigned this Dec 5, 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 4483e87 into microsoft:main Dec 6, 2022
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Thanks for these endless conformance improvements! ♾️ 😻 🎉

@frederick-vs-ja frederick-vs-ja deleted the lwg-3717 branch December 7, 2022 02:47
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@StephanTLavavej StephanTLavavej StephanTLavavej approved these changes

@strega-nil-ms strega-nil-ms strega-nil-ms approved these changes

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LWG-3717 common_view::end should improve random_access_range case
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@frederick-vs-ja @strega-nil-ms @StephanTLavavej
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