example4_virtual_inheritance_diamond_problem.cpp

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
#include <iostream>

class Animal {
protected:
    std::string name;

public:
    Animal(const std::string& n) : name(n) {}
    virtual void eat() const {
        std::cout << name << " is eating." << std::endl;
    }
};

class Mammal : virtual public Animal {
public:
    Mammal(const std::string& n) : Animal(n) {}
    void breathe() const {
        std::cout << name << " is breathing." << std::endl;
    }
};

class WingedAnimal : virtual public Animal {
public:
    WingedAnimal(const std::string& n) : Animal(n) {}
    void flap() const {
        std::cout << name << " is flapping wings." << std::endl;
    }
};

class Bat : public Mammal, public WingedAnimal {
public:
    Bat(const std::string& n) : Animal(n), Mammal(n), WingedAnimal(n) {}
    void echo() const {
        std::cout << name << " is using echolocation." << std::endl;
    }
};

int main() {
    Bat bat("Bruce");
    bat.eat();    // From Animal
    bat.breathe(); // From Mammal
    bat.flap();    // From WingedAnimal
    bat.echo();    // Bat's own method

    return 0;
}