cvt5.c

来自「this is a gcc file, you can download it 」· C语言 代码 · 共 29 行

// Build don't link: 
// GROUPS passed conversions
// cvt file
// Message-Id: <[e-mail]>
// From: [e-mail] (Jonas Nygren)
// Subject: g++ bug
// Date: Fri, 31 Jul 1992 14:28:56 GMT

class A {};
class B : public A {};

B b;

class R{
public:
  R() {}
  operator B&() { return b; }
};

void f(A&) {}

int main(){
  R r;

  f(r); // problem to cast to B& and then to A&
}