Урок 11 динамическое приведение типов

kutuzzzov

Apr 24th, 2023

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#include <iostream>
#include <string>
#include <string_view>
#include <vector>
using namespace std;
class Speakable {
public:
virtual ~Speakable() = default;
virtual void Speak(ostream& out) const = 0;
};
class Drawable {
public:
virtual ~Drawable() = default;
virtual void Draw(ostream& out) const = 0;
};
class Animal {
public:
virtual ~Animal() = default;
void Eat(string_view food) {
cout << GetType() << " is eating "sv << food << endl;
++energy_;
}
virtual string GetType() const = 0;
private:
int energy_ = 100;
};
class Fish : public Animal, public Drawable {
public:
string GetType() const override {
return "fish"s;
}
void Draw(ostream& out) const override {
out << "><(((*>"sv << endl;
}
};
class Cat : public Animal, public Speakable, public Drawable {
public:
void Speak(ostream& out) const override {
out << "Meow-meow"sv << endl;
}
void Draw(ostream& out) const override {
out << "(^w^)"sv << endl;
}
string GetType() const override {
return "cat"s;
}
};
// Рисует животных, которых можно нарисовать
void DrawAnimals(const std::vector<const Animal*>& animals, ostream& out) {
// Реализуйте самостоятельно
for (auto& animal : animals) {
if (const Drawable* ptr = dynamic_cast<const Drawable*>(animal)) {
ptr->Draw(out);
}
}
}
// Побеседовать с животными, которые умеют разговаривать
void TalkToAnimals(const std::vector<const Animal*> animals, ostream& out) {
// Реализуйте самостоятельно
for (auto& animal : animals) {
if (const Speakable* ptr = dynamic_cast<const Speakable*>(animal)) {
ptr->Speak(out);
}
}
}
void PlayWithAnimals(const std::vector<const Animal*> animals, ostream& out) {
TalkToAnimals(animals, out);
DrawAnimals(animals, out);
}
int main() {
Cat cat;
Fish fish;
vector<const Animal*> animals{&cat, &fish};
PlayWithAnimals(animals, cerr);
}

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