cppVirtualFunctionBasics

#include <iostream>

class BaseA
{
public:
    int valA;
public:
    BaseA() : valA { 1 } { std::cout << "BaseA DEFAULT ctor\n"; }
    BaseA(int valAP) : valA{valAP} { std::cout << "BaseA ctor valA\n"; }
    ~BaseA() { std::cout << "BaseA dtor\n"; }
    void info() { std::cout << "I'm BaseA\n"; }
};


class Child : public BaseA
{
protected:
    int childVal;
public:
    Child() : BaseA{111}, childVal{ 3 } { std::cout << "Child DEFAULT ctor\n"; }
    Child(int childValP) : childVal{ childValP } { std::cout << "ChildA ctor childValP\n"; }
    ~Child() { std::cout << "Child dtor\n"; }
    void info() { BaseA::info(); std::cout << "I'm Child\n"; }
};


class Animal
{
    std::string name;
public:
    Animal(std::string nameP) : name{ nameP } {}
    void sayHello()const { sound(); std::cout << " Hello, I'm " << name << '\n'; }
    virtual void sound()const = 0;/*{ std::cout << "??????"; }*/
};

class Cat : public Animal
{
public:
    Cat(std::string nameP) : Animal{ nameP } {}
    virtual void sound()const override{ std::cout << "Meow!"; }
};

class Dog : public Animal
{
public:
    Dog(std::string nameP) : Animal{ nameP } {}
    virtual void sound()const override{ std::cout << "RRwaFF!"; }
};

class Parrot : public Animal
{
public:
    Parrot(std::string nameP) : Animal{ nameP } {}
    virtual void sound()const override{ std::cout << "KrrrrAA!"; }
};

void introduce(const Animal& animal)
{
    animal.sayHello();
}

//void introduce(const Cat& animal)
//{
//    animal.sound(); std::cout << " Hello, I'm " << animal.name << '\n';
//}
//
//void introduce(const Dog& animal)
//{
//    animal.sound(); std::cout << " Hello, I'm " << animal.name << '\n';
//}
//
//void introduce(const Parrot& animal)
//{
//    animal.sound(); std::cout << " Hello, I'm " << animal.name << '\n';
//}

int main()
{
    Animal* animals[]{ new Cat{ "Murzik" }, new Dog {"Rex"}, new Parrot { "Kesha" } };

    /*Cat cat{ "Murzik" };
    Dog dog{"Rex"};
    Parrot parrot{ "Kesha" };*/


    //cat.sound(); std::cout << '\n';
    //dog.sound(); std::cout << '\n';
    //parrot.sound(); std::cout << '\n';

    /*introduce(cat);
    introduce(dog);
    introduce(parrot);*/

    for (const auto& animal : animals) { animal->sayHello(); }
}