Efficient complex inheritance in C++

Question

I want to make a code in which I have the classes A, B, C, D, E and V, W, X, Y, Z. I may also make base classes for each 5 classes. I want to randomly create derived classes which inherit from one class in the first group and one in the second group. How to do that without having to create 5*5=25 "if" cases?

Answer 1

I dint understand something... First, why on this earth someone would be do something like that? Second, you have two groups of 5 different classes and you would create RANDOMATICALLY (then automatically) some class which anyone inherit from either groups... If yes, how you can do it? What i know, you have to declare before compilation hierarchy... You use some preprocessing tool?

Answer 2

Well, for example I may want to create characters, with each character having a nationality (defined in a class from one group) and an occupation (defined in a class from the other group). And no, I don't have any special tools

Answer 3

And it wouldn't be better with defining nationality and occupation as variable types, because for each nationality I could have, for example, a specific version of a function "void say_hi()", as well as more specific things

Answer 4

I thinks that you going to over/bad use OOP... Nationality and occupation are proprieries of a character... You can do:

class Character{
private;
Nationality nationnality;
Occupation occupation;
//......

Answer 5

You can create a "say_hi" method that delegate to narionality instance:

void Character::say_hi(){
this->nationality.say_hi();
}

Answer 6

I guess that the best would be to specifically declare each of the 25 finite classes and at the end of each declaration create a random number of characters of that type, and then use base type pointers for everything else. It's like a line or two of code for each of those 25

Answer 7

That's an interesting idea, will think about some sort of encapsulation

Answer 8

I would prefer that Nationality have some methods that return translated words and use they in Character class:

class Nationality{
void getHi(){return "Hi";}
}

void Character::say_hi(){
cout<<this->nationality.getHi()<<endl;
}

OR better use a map

Answer 9

May be I do not understand the question but read a book "Patterns: Elements of Reusable Object-Oriented Software by Gang of Four"
https://www.sololearn.com/learn/676/?ref=app