Property again...

#include <iostream>

template <typename Type, class MainClass, Type MainClass::*Member, bool is_get_public, bool is_set_public>
struct property;

template <typename Type, class MainClass, Type MainClass::*Member>
struct property<Type, MainClass, Member, true, true>
{
public:
    property(MainClass& o): obj(o) {};
    Type& operator =(const Type& val)
    {
        return obj.*Member=val;
    }

    operator Type()
    {
        return obj.*Member;
    }

    MainClass& obj;
};

struct S
{
private:
    int _a;

public:
    property<int, S, &S::_a, true, true> a; //(*this)
    S(): a(*this) {}
};

int main()
{
    using namespace std;
    S s;
    s.a=12;
    cout << (int)s.a;
}