C++——string的封装

参考string类完成my_string类

#include 
#include
using namespace std;
class my_string
{
private:
    char *str;
    int len;
public:
    //无参构造
    my_string()
    {
        len = 15;
        str = new char[len];
        cout<<"无参构造"<
    }
    //有参构造
    my_string(char *p)
    {
        len = 15;
        this->str = new char[len];
        memset(str,0,15);
        strcpy(str,p);
        cout<<"有参构造"<
    }
    //拷贝构造
    my_string(const my_string &other)
    {
        len=15;
        this->str=new char[len];
        memset(str,0,15);
        strcpy(str,other.str);
 
    }
    //拷贝赋值
    my_string &operator=(const my_string &other)
    {
        if(&other !=this)
        {
            len=15;
            this->str=new char[len];
            memset(str,0,15);
            strcpy(str,other.str);
        }
 
    }
    //析构函数
    ~my_string()
    {
        delete str;
        cout<<"析构函数"<<"  "<<this<
    }
    void show()
    {
        cout<
    }
    //判空
    bool empty()
    {
        if(*str==0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    //求总长度
    int size()
    {
        int l=0;
        char *q=str;
        while(*q!=0)
        {l++;
            q++;
        }
 
        return l;
    }
    //at()
    char &at(int pos){}
    //转c风格字符串函数
    char *c_str(){};
};
int main()
{
    char * p ="hello" ;
    my_string s1;
    my_string s2(p);
    s2.show();
    my_string s4(s2);
    s4.show();
    my_string s5;
    s5=s4;
    s5.show();
    cout<size()<
 
 
    return 0;
}