[LLVMbugs] [Bug 17147] New: __debug_less() does not support heterogeneous comparator

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17147

            Bug ID: 17147
           Summary: __debug_less() does not support heterogeneous
                    comparator
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: devlists at shadowlab.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Actually, the __debug_less implementation try to check if a comparator forces
"a strict weak ordering".

Unfortunately, this check is broken for heterogenous comparator, which are
supported by methods like std::lower_bound.
It tries to call the comparator with the arguments in reverse order, and so
prevent compilation of such valid code.

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