https://bugs.llvm.org/show_bug.cgi?id=47789
Bug ID: 47789
Summary: Clang 10 disallows modifying const member by an unused
member function in a templated class; while Clang 9
allows it
Product: clang
Version: 10.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Created attachment 24042
--> https://bugs.llvm.org/attachment.cgi?id=24042&action=edit
Sample program demonstrating the issue
I'm not sure this is a bug or not.
- The sample program has a class template with a const member.
- A member function attempts to modify the member.
- The program does not actually use that member function
- Clang 9 and gcc compile the code fine, while clang 10 gives an error.
I see this behavior only with template classes, so I was thinking it may be a
case of SFINAE (in which case clang 10 should not be giving an error). However,
some others on cpplang slack are of the opinion this is a case of IFNDR, and
clang 10 is basically issuing eager diagnostics.
Code is here https://godbolt.org/z/r9sT44
and also attached to this report
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