https://bugs.llvm.org/show_bug.cgi?id=43004
Bug ID: 43004
Summary: Variant constructors forbid narrowing conversions
Product: libc++
Version: 9.0
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: david.tr...@arm.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 22377
--> https://bugs.llvm.org/attachment.cgi?id=22377&action=edit
Narrowing conversion in variant constructor doesn't compile
I've attached a very simple file that builds with libc++ 8 and libstdc++ but
fails to build with libc++ 9. I've narrowed the change down to this commit
implementing P0608R3: https://reviews.llvm.org/D44865.
It appears that the paper forbids all narrowing conversions when constructing a
variant, is my understanding of that correct? If so it seems that this changes
behaviour in a way that breaks backwards compatibility even for code that isn't
defective and is valid C++17.
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