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20170825_string构造函数、析构函数、拷贝构造函数以及重载赋值运算符
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发布时间:2019-02-25

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20170825_string构造函数、析构函数、拷贝构造函数以及重载赋值运算符

//string类的构造函数#include
#include
#include
using namespace std;//编写类String的构造函数、析构函数和赋值函数,已知类String的原型为: class String{public: String(const char *str = NULL); // 普通构造函数 String(const String &other); // 拷贝构造函数 ~String(void); // 析构函数 String & operator=(const String &other); // 赋值函数 private: char *m_data; // 用于保存字符串 };//1、普通构造函数String::String(const char *str) { if(str==NULL) { m_data = new char[1]; //得分点:对空字符串自动申请存放结束标志'\0'的空间 *m_data = '\0'; //加分点:对m_data加 NULL 判断 } else { int length = strlen(str); m_data = new char[length+1]; //若能加 NULL 判断则更好 if(m_data==nullptr) { cout<<"out of space!"<

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