Strengthen exception specifications for stream types#3314
Merged
StephanTLavavej merged 10 commits intomicrosoft:mainfrom Jan 22, 2023
Merged
Strengthen exception specifications for stream types#3314StephanTLavavej merged 10 commits intomicrosoft:mainfrom
StephanTLavavej merged 10 commits intomicrosoft:mainfrom
Conversation
strega-nil-ms
suggested changes
Jan 3, 2023
strega-nil-ms
approved these changes
Jan 4, 2023
StephanTLavavej
approved these changes
Jan 21, 2023
Member
|
@strega-nil-ms FYI, I pushed a conflict-free merge with |
Member
|
I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
Member
|
Thanks for strengthening the STL! 🦾 🏋️ 📈 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This PR partially addresses #3278, but also strengthens exception specifications for some other functions. References to working draft are also updated to WG21-N4928.
Move assignment operators and
swapfunctions are generally marked withnoexcept. But I think move assignment operators ofbasic_filebufandbasic_(i|o)fstreamshouldn't benoexcept, because they callbasic_filebuf::closewhich may in turn call virtual functions that are possibly overridden. In other words, exception may be thrown from these move assignment operators.basic_syncbuf's should neither benoexceptdue to LWG-3498.Many move constructors remain non-
noexcept, because they need to copy-construct abasic_streambuf, and hence need to dynamically allocate storage forlocale. Maybe we should fix this in vNext.Currently EDG wrongly calculates
std::is_nothrow_move_assignable_v<std::osyncstream>andstd::is_nothrow_move_assignable_v<std::wosyncstream>asfalse, so these twostatic_asserts are skipped for EDG.