[LLVMbugs] [Bug 18226] New: invalid 'use of class template %s requires template arguments'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18226

            Bug ID: 18226
           Summary: invalid 'use of class template %s requires template
                    arguments'
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vanyacpp at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

On the following code clang gives error:

1.cpp:16:26: error: use of class template y requires template arguments
     friend void x<U>::f(y);
                         ^
But gcc and msvc compiles this code without any error.

template <typename U>
struct y;

template <typename T>
struct x
{
    void f(y<T> a)
    {
        a.a = 5;
    }
};

template <typename U>
struct y
{
     friend void x<U>::f(y); // error here

private:
     int a;
};

int main()
{
    x<int>().f(y<int>());
}

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