[LLVMbugs] [Bug 19182] New: Can't use constexpr function-pointer member as non-type template parameter

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19182

            Bug ID: 19182
           Summary: Can't use constexpr function-pointer member as
                    non-type template parameter
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: coder0xff+llvm_org_bugs at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following code does not compile (though it should, and does using gcc):

////////////////
typedef int (*t)();

template<t ptr>
class A {
public:
    static constexpr t a = ptr;
};

int f() { return 0; }

class B : public A<&f> {

};

template<typename u>
class C : public A<u::a> {

};

C<B> dummy;
///////////////

$ clang++ -std=c++11 clang_test.cpp

clang_test.cpp:16:20 error: non-type template argument for template parameter
      of pointer type 't' (aka 'int (*)()') must have its address taken
class C : public A<u::a> {
                   ^

This bug occurs in at least 3.3 and 3.4, on OSX and Ubuntu.

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