[Bug c++/86184] Shall gcc support this feature?

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86184

--- Comment #2 from zhonghao at pku dot org.cn ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to zhonghao from comment #0)
> > gcc++ produces errors when compiling the following code:
> 
> I don't see any errors. You didn't say which version of GCC you're using or
> what options you're using, as requested by https://gcc.gnu.org/bugs/

I am sorry. I provide a wrong code sample from the clang bug report. The
correct code sample is:

 #include <stdio.h>

 struct X {
 X() { printf("X(): this=%p\n", this); }
 X(const X& other) { printf("X(const &X):this=%p, other=%p\n", this, &other); }
 ~X() { printf("~X(): this=%p\n", this); }
 operator bool() { printf("X::operator bool(): this=%p\n", this); return true;
}
 };

 int main() {
 X x = X()? : X();
 }

g++ rejects the above code, and the error message is:
error: lvalue required as unary '&' operand
  X x = X()? : X();

clang++ accepts the code.