c++自定义String

Xiezequan

已于 2025-01-14 09:30:55 修改

阅读量933

点赞数 24

分类专栏：坐牢集合文章标签： c++ 开发语言

于 2025-01-13 21:20:40 首次发布

本文链接：https://blog.youkuaiyun.com/sbhsjjs/article/details/145121260

版权

mystring.c

#include "mystring.h"
#define SIZE 8
#include"mystring.h"
//计算所需最小满足len的容量 每次都是8的倍数
int max_size(int len,int maxsize){
   

    while(len>maxsize){
   
        maxsize*=2;
    }
    return maxsize;
}
//构造函数
mystring::mystring(){
   
    //初始化
    size=0;
    maxsize=SIZE;
    str=new char[size];
    cout<<"无参构造"<<endl;
}
//有参构造
mystring::mystring(const char * str1){
   
    //初始化
     size=strlen(str1);
    maxsize=max_size(size+1,SIZE);//计算出最小满足len的容量 需要考虑'\0'
    str=new char[maxsize];
    //拷贝
    memcpy(str,str1,size+1);//需要考虑'\0'
    cout<<"mystring::有参"<<endl;

}
mystring::mystring(int n,char ch){
   
    maxsize=max_size(n+1,SIZE);//\0
    size=n;
    str=new char[maxsize];
    int i=0;
    for(i=0;i<size;i++){
   
        str[i]=ch;
    }
    str[i]='\0';

}
//析构函数
mystring::~mystring(){
   
    delete []str;
    cout<<"析构"<<endl;
}
//拷贝构造函数
mystring ::mystring(const mystring &other){
   
    //初始化
    if(other.str==NULL){
   return ;}
    size=other.size;
    maxsize=other.maxsize;
    str=new char[maxsize];
    //拷贝
    memcpy(str,other.str,maxsize);
    cout<<"拷贝构造函数"<<endl;
}


//拷贝赋值函数
mystring & mystring::operator=(const mystring &other){
   
    size=other.size;
    maxsize=other.maxsize;
    delete []str;
    str=new char[maxsize];
    memcpy(str,other.str,maxsize);
    cout<<"拷贝赋值函数"<<endl;
    return *this;
}
mystring & mystring::operator=(const char * str1){
   
    //初始化
     size=strlen(str1);
     maxsize=SIZE;
    maxsize=max_size(size+1,maxsize);
    str=new char[maxsize]

最低0.47元/天解锁文章