[llvm-bugs] [Bug 28304] New: Private template method address for default argument compiles fine with GCC but not with Clang

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28304

            Bug ID: 28304
           Summary: Private template method address for default argument
                    compiles fine with GCC but not with Clang
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: johnmph at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

This code compiles with GCC but not with Clang ("'func' is a private member of
'Test'" error) :

#include <iostream>
#include <functional>


int func3() { return 3; }

struct Test {
    template <typename F = std::function<int (void)>> Test(F &&f = func<int>) :
_f(std::forward<F>(f)) {}  // Compile only with GCC
    //template <typename F = std::function<int (void)>> Test(F &&f = func2) :
_f(std::forward<F>(f)) {}  // Compile with GCC and Clang
    //Test (std::function<int (void)> f = func<int>) : _f(f) {} // Compile with
GCC and Clang

    int get() const { return _f(); }

private:
    template <typename T> static T func() { return 1; }
    static int func2() { return 2; }

    std::function<int (void)> _f;
};

int main() {
    Test t1, t2(func3);

    std::cout << t1.get() << ", " << t2.get() << std::endl;
}

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