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#include <iostream>
using namespace std;
 
class Foo
{
public:
	operator int () { return 5; }
	operator long () { return 100; }
};
 
int main() {
	Foo foo1, foo2;
	int var1 = foo1 + foo2;
	long var2 = foo1 + foo2;
 
	cout << var1 << endl << var2 << endl;
 
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:13:18: error: ambiguous overload for 'operator+' (operand types are 'Foo' and 'Foo')
  int var1 = foo1 + foo2;
                  ^
prog.cpp:13:18: note: candidate: operator+(int, int) <built-in>
prog.cpp:13:18: note: candidate: operator+(int, long int) <built-in>
prog.cpp:13:18: note: candidate: operator+(long int, int) <built-in>
prog.cpp:13:18: note: candidate: operator+(long int, long int) <built-in>
prog.cpp:14:19: error: ambiguous overload for 'operator+' (operand types are 'Foo' and 'Foo')
  long var2 = foo1 + foo2;
                   ^
prog.cpp:14:19: note: candidate: operator+(int, int) <built-in>
prog.cpp:14:19: note: candidate: operator+(int, long int) <built-in>
prog.cpp:14:19: note: candidate: operator+(long int, int) <built-in>
prog.cpp:14:19: note: candidate: operator+(long int, long int) <built-in>

Standard output is empty