The idea is for the users to create a new class and inherit only the base class and few special classes whose special functions they want.
class Base {
Data data;
public:
void init(Data d) data(d) {}
// other basic functions
}
class SpecialX: public Base {
public:
Result specialX() {
Result r = compute(data); // uses Base::data to compute some result
return r;
}
}
class SpecialY: public Base {
public:
Result specialY() {
Result r = compute(data); // uses Base::data to compute some result
return r;
}
}
If user wants only init and specialX functions, they could do something like -
class My: public Base, public SpecialX {} // user doesn't need specialY function, so they do not inherit it
My m;
m.init(someData);
m.specialX(); // returns the result by computing specialX
But this throws the ambiguity error due to the Diamond problem in C++.
How do I structure my classes so that I can create as many special classes as I want, and let users inherit the ones that they need?
