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Fix truncation warnings in allocate_shared() #4252

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StephanTLavavej
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Found by std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp in the upcoming libcxx update.

memory(2858): warning C4267: 'argument': conversion from 'size_t' to 'test_allocator<U>::size_type', possible loss of data

We need to _Convert_size when allocating, but if that succeeds, we can simply static_cast when deallocating.

std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp

memory(2858): warning C4267: 'argument': conversion from 'size_t' to 'test_allocator<U>::size_type', possible loss of data

We need to `_Convert_size` when allocating, but if that succeeds, we can simply `static_cast` when deallocating.
@StephanTLavavej StephanTLavavej added the bug Something isn't working label Dec 10, 2023
@StephanTLavavej StephanTLavavej requested a review from a team as a code owner December 10, 2023 07:40
@StephanTLavavej StephanTLavavej self-assigned this Dec 14, 2023
@StephanTLavavej
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StephanTLavavej commented Dec 14, 2023

I'm speculatively mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

@StephanTLavavej StephanTLavavej merged commit 7276976 into microsoft:main Dec 14, 2023
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@StephanTLavavej StephanTLavavej deleted the allocate_shared-truncation-warnings branch December 14, 2023 22:10
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2 participants