[llvm-bugs] [Bug 41876] New: std::hash should not accept std::basic_strings with custom character traits

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41876

            Bug ID: 41876
           Summary: std::hash should not accept std::basic_strings with
                    custom character traits
           Product: libc++
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: marc at groundctl.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

libc++ provides a specialization of std::hash that works for arbitrary
instantiations of std::basic_string.  This can produce incorrect behavior for
basic_string instantiations with custom character traits that override equality
(e.g. traits for case-insensitive comparison).  Since the standard only
requires that hash for for the typedefed instantiations (e.g. hash<string>,
hash<wstring>, etc), libc++ should not support hashing basic_strings with
custom character traits to avoid incorrect behavior.

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