C++-进行深度拷贝

构造动态变量进行*m_pi = *that.m_pi

/*
自定义的深拷贝 
*/ 
#include <iostream>

using namespace std; 

class Integer{
public:
    Integer(int i) {
        m_pi = new int; //使用new int 定义地址 
        *m_pi = i; 
    }
    ~Integer(void) {
        delete m_pi; 
    }
    void print(void) {
        cout << "输出的数字是" << *m_pi << endl; 
    }
    /*
    Integer(const Integer& that) {
        cout << "缺省浅拷贝" << endl; 
        m_i = that.m_i; 
    }
    */ 
    Integer(const Integer& that) {
        cout << "深拷贝" << endl;
        m_pi = new int;
        *m_pi = *that.m_pi;     
    }

private:
    int *m_pi; 

}; 

int main() {
    Integer i(200); 
    Integer i2(i); 
    i2.print(); 

}

对字符串进行深度拷贝

/*
string 字符串 
*/ 
#include <iostream>
#include <cstring>

using namespace std; 

class String {
public:
    String(const char* str) {
        m_str = new char[strlen(str)+1]; 
        strcpy(m_str, str); 
    }
    ~String(void) {
        cout << "析构函数" << endl; 
        delete m_str; 
    }
    //深拷贝 
    String(const String& that) {
　　　　//进行字符串的复制操作 
        m_str = new char[strlen(that.m_str)+1]; 
        strcpy(m_str, that.m_str); 
    }
    void print(void) {
        cout << m_str << endl; 
    }
    const char* c_str(void) const {
        return m_str; 
    }

private:
    char* m_str; 

}; 

int main() {
    String s = "hello"; 
    cout << s.c_str() << endl; 
    String s1(s); 
    cout << s1.c_str() << endl; 
    

}