class Base{
public:
    Base();
    virtual ~Base();
public:
    char *m_pName;
};

Base::Base(){
     cout<<"Base()"<<endl;
    m_pName = new char[1024];
    memset(m_pName, 0, 1024);
}

Base::~Base(){
    cout<<"~Base()"<<endl;
    if (m_pName) {
        delete [] m_pName;
        m_pName = NULL;
    }
}

class Child:public Base{
public:
    Child();
    ~Child();
public:
    char *m_pAge;
};

Child::Child(){
    cout<<"Child()"<<endl;
    m_pAge = new char[2048];
    memset(m_pAge, 0, 2048);
}
Child::~Child(){
    cout<<"~Child()"<<endl;
    if (m_pAge) {
        delete [] m_pAge;
        m_pAge = NULL;
    }
}

int main(){
    Base *pBase = new Child();
    delete pBase;
}

输出如下：
Base()
Child()
~Base()

这样导致内存泄漏，因为子类的析构函数没有被调用。
修改这类问题，把基类析构函数声明为virtual.

class Base{
public:
    Base();
    virtual ~Base();
public:
    char *m_pName;
};

输出：
Base()
Child()
~Child()
~Base()