【牛客带你学编程C++方向】项目练习第1期

//普通构造 MyString::MyString(const char *str){ if(str == NULL){ m_data = new char[1]; //对空字符串自动申请存放结束标志'\0'的空 *m_data = '\0'; } else{ int length = strlen(str); m_data = new char[length+1]; strcpy(m_data,str); } } //拷贝构造 MyString::MyString(const MyString &other){ int length = strlen(other.m_data); m_data = new char[length+1]; strcpy(m_data,other.m_data); } //析构函数 MyString::~MyString(){ delete [] m_data; //[]:一组对象 } //赋值函数 MyString & MyString::operator = (const MyString &other){ //输入参数为const型 if(this == &other) //检查自赋值 return *this; delete [] m_data; //释放原有内存 int length = strlen(other.m_data); m_data = new char[length+1]; //对m_data加NULL,判断 strcpy(m_data,other.m_data); return *this; //返回本对象的引用 }

补充： MyString mys1,mys3; MyString mys2 = mys1; //拷贝构造 mys3 = mys2; //赋值拷贝

参照：https://www.nowcoder.com/discuss/66749