[C++知识库]用C++手动简单实现string类

#include<iostream>
#include<cstring>
using namespace std;

class myString {
public:
	myString(const char* str = "") {
		strSize = strlen(str) + 1;
		this->str = new char[strSize];
		strcpy_s(this->str, strSize, str);
	}
	myString(const myString& object) {
		strSize = object.strSize;
		this->str = new char[strSize];
		strcpy_s(this->str, strSize, object.str);
	}
	char* c_str() {
		return str;
	}
	char* data() {
		return str;
	}

	~myString(){
		delete[] str;
		str = nullptr;
	}
	myString append(const myString& object) {
		myString temp;
		temp.strSize = myString::strSize + object.strSize - 1;
		temp.str = new char[temp.strSize];
		memset(temp.str, 0, temp.strSize);
		strcat_s (temp.str, temp.strSize, myString::str);
		strcat_s (temp.str, temp.strSize, object.str);
		return temp;
		

	}
	int compare(const myString& object) {
		return strcmp(myString::str, object.str);
	}
protected:
	char* str;
	int strSize;
};
//1.实现string中创建方式
int main() {
	myString str1;
	myString str2("ILoveyou");
	myString str3(str1);
	myString str4 = str2;
	//2.通过实现data和c_str函数 打印字符串

	cout << str2.c_str() << endl;  //打印ILoveyou
	cout << str2.data() << endl;   //打印ILoveyou
	//3.实现append 实现字符串的链接
	myString strOne = "one";
	myString strTwo = "two";
	myString strThree = strOne.append(strTwo);
	cout << strThree.data() << endl;	    //onetwo
	//4.实现字符串比较
	cout << strOne.compare(strOne) << endl;	//0
	//5.手写析构函数释放内存
	return 0;
}