template <typename T>
void f(T) = delete;

void f(int) {}

struct X{ operator int() const { return 0;} };

int main()
{
    f(1);		//OK
    f(1u);		//ERROR
    f(1lu);		//ERROR
    f(1.);		//ERROR
    f('c');		//ERROR
    f(X{});		//ERROR
}