cpp 实现简易String类

需求

实现一个String类

自己写的String

headers/String.h

#ifndef __MYSTRING__
#define __MYSTRING__
#include 

class String
{
public:
    // 构造函数
    String(const char* c_str = 0);
    // 拷贝构造函数
    String(const String& str);
    // 析构函数
    ~String();
    // 赋值函数
    String& operator = (const String& str);
    char* get_c_str() const { return data; }

private:
    char* data;
};

inline String::String(const char* c_str) {
    if(c_str) {
        this->data = new char[strlen(c_str)+1];
        strcpy(data, c_str);
    } else {
        this->data = new char[1];
        this->data[0] = '\0';
    }
}
inline String::~String() {
    delete []data;
}

inline String::String(const String& str) {
    this->data = new char[strlen(str.data) + 1];
    strcpy(this->data, str.data);
}

inline String& String::operator = (const String& str) {
    if (this == &str)
        return *this;
    delete []this->data;
    this->data = new char[strlen(str.data) + 1];
    strcpy(data, str.data);
    return *this;
}


#endif // __MYSTRING__

main.cpp

#include 
#include "headers/String.h"
using namespace std;

int main()
{
    String str;
    cout << str.get_c_str() << endl;
    String str1("2333");
    cout << str1.get_c_str() << endl;
    str = str1;
    cout << str.get_c_str() << endl;
    return 0;
}

转载于:https://www.cnblogs.com/Draymonder/p/11523746.html