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b.cpp
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b.cpp
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#include <memory>
#include <string>
#include <iostream>
using namespace std;
struct IObject {
IObject() = default;
IObject(IObject const &) = default;
IObject &operator=(IObject const &) = default;
virtual ~IObject() = default;
virtual void eatFood() = 0;
virtual shared_ptr<IObject> clone() const = 0;
};
struct CatObject : IObject {
string m_catFood = "someFish";
virtual void eatFood() override {
cout << "eating " << m_catFood << endl;
m_catFood = "fishBones";
}
virtual shared_ptr<IObject> clone() const override {
return make_shared<CatObject>(*this);
}
virtual ~CatObject() override = default;
};
struct DogObject : IObject {
string m_dogFood = "someMeat";
virtual void eatFood() override {
cout << "eating " << m_dogFood << endl;
m_dogFood = "meatBones";
}
virtual shared_ptr<IObject> clone() const override {
return make_shared<DogObject>(*this);
}
virtual ~DogObject() override = default;
};
void eatTwice(IObject *obj) {
shared_ptr<IObject> newObj = obj->clone();
obj->eatFood();
newObj->eatFood();
}
int main() {
shared_ptr<CatObject> cat = make_shared<CatObject>();
shared_ptr<DogObject> dog = make_shared<DogObject>();
eatTwice(cat.get());
eatTwice(dog.get());
return 0;
}