string 替换函数

 

生活中的小应用 给力啊·函数的替换

#include<iostream>
using namespace std;
string &replace_all(string& str, const  string& old_value, const  string& new_value)
{
    while (true)
    {
        string::size_type pos(0);
        if ((pos=str.find(old_value))!=string::npos)
            str.replace(pos,old_value.length(),new_value);
        else break;
    }
    return str;
}
string &replace_all_distinct(string& str,const string&old_value,const string& new_value)
{
    for (string::size_type pos(0);pos!=string::npos;pos+=new_value.length())
    {
        if ((pos=str.find(old_value,pos))!=string::npos)
            str.replace(pos,old_value.length(),new_value);
        else 
		break;
    }
    return str;
}
int main()
{    
   string s1="12212";
   string s2="12212";

    cout<<replace_all(s1,"12" ,"21")<<endl;
    cout<<replace_all_distinct(s2,"12","21")<<endl;
    return 0;
}
/*
输出如下:
22211
21221
*/