#include <iostream>
class some_base
{
public:
class base_func_args;
virtual void func(base_func_args &) = 0; };
class some_base::base_func_args
{
public:
int i;
};
class some_derived : public some_base
{ public:
class derived_func_args;
void func(derived_func_args &);
};
class derived_func_args : public some_base::base_func_args
{
public:
float f;
};
class some_derived::func(derived_func_args &a) {
std::cout << a.i << ' ' << a.f << std::endl;
}
int
main()
{
some_derived d; some_derived::derived_func_args dfa; some_base *b = &d;
dfa.i = 10;
dfa.f = 20;
b->func(dfs); return 0;
}