friend17.c

来自「this is a gcc file, you can download it 」· C语言 代码 · 共 13 行

template <class T>
struct X {
  template <class U> void operator+=(U);
  
  template <class V>
  template <class U>
  friend void X<V>::operator+=(U);
};

int main() {   
  X<int>() += 1.0;
}