fix: use abstract

ex01/src/Cat.cpp

@@ -10,6 +10,7 @@ Cat::Cat()
 
 Cat& Cat::operator=(const Cat& src)
 {
+	*this->brain = *src.brain;
 	this->type = src.type;
 	return *this;
 }
@@ -22,6 +23,7 @@ Cat::~Cat()
 
 Cat::Cat(const Cat& src): Animal()
 {
+	this->brain = new Brain();
 	*this = src;
 }
 

ex01/src/Dog.cpp

@@ -11,6 +11,7 @@ Dog::Dog()
 
 Dog& Dog::operator=(const Dog& src)
 {
+	*this->brain = *src.brain;
 	this->type = src.type;
 	return *this;
 }
@@ -23,6 +24,7 @@ Dog::~Dog()
 
 Dog::Dog(const Dog& src): Animal()
 {
+	this->brain = new Brain();
 	*this = src;
 }
 

ex01/src/main.cpp

@@ -15,6 +15,10 @@ int main()
 	delete i;
 	const WrongAnimal* k = new WrongCat();
 	k->makeSound();
+	Dog test;
+	{
+		Dog test2 = test;
+	}
 	delete k;
 	return 0;
 }