[LLVMbugs] [Bug 6970] New: Clang does not convert "ptr to const member function" to "ptr to member function"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6970

           Summary: Clang does not convert "ptr to const member function"
                    to "ptr to member function"
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: matthewbg at google.com
                CC: llvmbugs at cs.uiuc.edu, nlewycky at google.com,
                    dgregor at apple.com


The C++ standard doesn't explicitly allow conversion of "(T::*)() const" to
"(T::*)()". While this will hopefully be fixed at some point, in the interim it
would be great if Clang would allow this behavior as an extension. Currently
(see attached const_member_function.cc):
% clang++ -fsyntax-only const_member_function.cc 
const_member_function.cc:10:3: error: no matching function for call to 'g'
  g(&X::foo);
  ^
const_member_function.cc:6:6: note: candidate function not viable: no known
      conversion from 'void (X::*)() const' to 'void (X::*)()' for 1st argument
void g(void (X::*ptr_to_member)(void)) {
     ^
1 error generated.

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