Workaround for the interaction of constraints in expected and explicit template instantiation in permissive modes
#4658
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- In `<expected>`, check `is_swappable` as `is_swappable_v` can be buggy in permissive modes. - In `<iterator>`, avoid instantiation of `contiguous_iterator` for `istreambuf_iterator` and `ostreambuf_iterator`, which are instantiated in locale facets. Also adds test coverage for `expected` in permissive modes.
miscco
reviewed
May 8, 2024
tests/std/tests/GH_004657_expected_constraints_permissive/test.compile.pass.cpp
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StephanTLavavej
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May 15, 2024
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Thanks - a good workaround for a disgusting mode! 🤮 😹 I explored whether |
frederick-vs-ja
commented
May 15, 2024
tests/std/tests/GH_004657_expected_constraints_permissive/test.compile.pass.cpp
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StephanTLavavej
approved these changes
May 15, 2024
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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Thanks again for investigating and fixing this bug! 🛠️ 🚀 🐞 |
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Fixes #4657.
Works around DevCom-10652420, which is closed as Not a Bug. Works around/permissive-.<expected>, checkis_swappableasis_swappable_vcan be buggy in permissive modes.<iterator>, avoid instantiation ofcontiguous_iteratorforistreambuf_iteratorandostreambuf_iterator, which are instantiated in locale facets.Also adds test coverage for
expectedin permissive modes.