#include <iostream>
class Base
{
public:
// From https://stackoverflow.com/a/9779391/1270789
template<typename T, typename R>
R proxycall(T *obj, R (T::*mf)(int))
{
return (obj->*mf)(42);
}
// My attempt
template<typename T, typename R>
R proxycall(R (T::*mf)(int))
{
return ((dynamic_cast<T *>(this))->*mf)(42);
}
virtual ~Base() {}
};
class Foo: public Base
{
public:
int doFoo(int x) { std::cout << "doing foo\n"; return x / 2; }
int doCall() { return proxycall(this, &Foo::doFoo); } // OK
int doNoThisCall() { return proxycall(&Foo::doFoo); } // Is this OK?
};
int main()
{
Foo foo;
std::cout << foo.doCall() << '\n';
std::cout << foo.doNoThisCall() << '\n';
return 0;
}
