C++字符串中字符替换

C++ string_replace.cpp

string replace(const string& old_value, const string& new_value, const string& str)
{
    string ret = str;
    replaceSrc(old_value, new_value, ret);
    return ret;
}

inline void replaceSrc(const string& old_value, const string& new_value, string& str)
{
    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;   
    }
}