[llvm-bugs] [Bug 18074] Undefined references when using pointer to member functions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=18074

Marshall Clow (home) <mclow.lists at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #10 from Marshall Clow (home) <mclow.lists at gmail.com> ---
This has been clarified in the latest draft standard. [namespace.std]/6 now
says:

Let F denote a standard library function (16.5.5.4), a standard library static
member function, or an instantiation of a standard library function template.
Unless F is designated an addressable function, the behavior of a C++ program
is unspecified (possibly ill-formed) if it explicitly or implicitly attempts to
form a pointer to F. 
[ Note ... end note]
Moreover, the behavior of a C++ program is unspecified (possibly ill-formed) if
it attempts to form a reference to F or if it attempts to form a
pointer-to-member designating either a standard library non-static member
function (16.5.5.5) or an instantiation of a standard library member function
template.

The upshot of all that is that the behavior of your example program is
"unspecified (possibly ill-formed)".

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