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#include <stdint.h>
 
class C64 {
 
  uint64_t Value;
 
  public:
 
  C64 () : Value (0) { }
 
  operator uint64_t () const { return Value; }
  operator int64_t () const { return Value; }
  void operator = (uint64_t S) { Value = S; }
  void operator = (int64_t S) { Value = S; }
 
};
 
void f () {
 
  C64 c;
 
  int i = 0;
  unsigned int ui = 0;
 
  bool b = (c == 0);
 
  c = i;
  c = ui;
 
}
 
int main() {
	f();
}

prog.cpp: In function ‘void f()’:
prog.cpp:25:15: error: ambiguous overload for ‘operator==’ (operand types are ‘C64’ and ‘int’)
   bool b = (c == 0);
             ~~^~~~
prog.cpp:25:15: note: candidate: operator==(uint64_t {aka long unsigned int}, int) <built-in>
prog.cpp:25:15: note: candidate: operator==(int64_t {aka long int}, int) <built-in>
prog.cpp:27:7: error: ambiguous overload for ‘operator=’ (operand types are ‘C64’ and ‘int’)
   c = i;
       ^
prog.cpp:13:8: note: candidate: void C64::operator=(uint64_t)
   void operator = (uint64_t S) { Value = S; }
        ^~~~~~~~
prog.cpp:14:8: note: candidate: void C64::operator=(int64_t)
   void operator = (int64_t S) { Value = S; }
        ^~~~~~~~
prog.cpp:28:7: error: ambiguous overload for ‘operator=’ (operand types are ‘C64’ and ‘unsigned int’)
   c = ui;
       ^~
prog.cpp:13:8: note: candidate: void C64::operator=(uint64_t)
   void operator = (uint64_t S) { Value = S; }
        ^~~~~~~~
prog.cpp:14:8: note: candidate: void C64::operator=(int64_t)
   void operator = (int64_t S) { Value = S; }
        ^~~~~~~~

Standard output is empty