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直接看代码更直观，注释都在代码里

#include 
   
    using namespace std;//浅拷贝democlass A{public:	~A()	{		cout << "A析构函数" << endl;	}	A() :m_num(0){}	void setNum(int num){		m_num = num;	}	int getNum()	{		return m_num;	}private:	int m_num;};//深拷贝demo1 内存泄漏版class B{public:	B(const char *str = ""){		cout << "B构造函数" << endl;		m_data = new char[strlen(str) + 1];		memset(m_data, 0, strlen(str) + 1);		memcpy(m_data, str, strlen(str));	}	~B(){		if (m_data)		{			cout << "B析构函数" << endl;			delete m_data;			m_data = nullptr;		}	}	char *m_data;};//深拷贝demo2 正常版class C{public:	C(const char *str=""){		cout << "C构造函数" << endl;		m_data = new char[strlen(str) + 1];		cout << "sizeof(m_data)=" << sizeof(m_data)			<<" sizeof(*m_data)="<
    
     <<" strlen(str)+1="<
     
      << endl;		memset(m_data, 0, strlen(str) + 1);		memcpy(m_data, str, strlen(str));	}	~C(){		if (m_data)		{			cout << "C析构函数" << endl;			delete m_data;			m_data = nullptr;		}	}	C(const C &c)	{		cout << "拷贝构造" << endl;		int len = strlen(c.m_data) + 1;		m_data = new char[len];		memset(m_data, 0, len);		memcpy(m_data, c.m_data, strlen(c.m_data));	}	char *getData()	{		return m_data;	}	char *m_data;};//客户端int main(){	//浅拷贝 没有指针的时候，不需要担心内存泄漏	A a;	a.setNum(10);	A a1 = a;		cout << "num=" << a.getNum() << endl;	//输出10	cout << "num=" << a1.getNum() << endl;	//输出10	//深拷贝 崩溃版，指针指向同一块内存，析构时释放指针会被释放两次	//B b;	//B b1 = b;	//深拷贝 正常版	C c("123456");	cout << "c=" << c.getData() << endl;	C c1 = c;	cout << "c1="<
      
       << endl;	return 0;}
      
     
    
   

效果

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