我有一个带有构造函数和析构函数的动物类。猫有一个私有的大脑*属性。构建时，猫使用new Brain（）创建他的大脑；销毁时，猫删除了他的大脑。我不明白为什么猫和大脑的析构函数没有被调用，当我的基本类析构函数是虚拟的？

#include <iostream>

using std::cout ;
using std::endl ;

class Brain {
public:
    Brain (void){cout << "Brain constructor" << endl ;}
    ~Brain (void){cout << "Brain destructor" << endl ;}
} ;

class Animal
{
public:
    Animal (void){cout << "Animal constructor" << endl ;}
    virtual ~Animal (void){cout << "Animal destructor" << endl ;}
} ;

class Cat : public Animal
{
public:
    Cat (void){
                cout << "Cat constructor" << endl ;
        myPointer = new Brain() ;
    }
    ~Cat (void){
        cout << "Cat destructor" << endl ;
        delete myPointer ;
    }
private:
    Brain* myPointer ;
} ;

int main()
{
    const Animal* j = new Cat[1] ;
    delete [] j ;
}

给出输出

Animal constructor
Cat constructor
Brain constructor
Animal destructor