C++分割string字符串（转）

vector<string> split(const string& str, const string& pattern)
{
    vector<string> ret;
    if(pattern.empty()) return ret;
    size_t start=0,index=str.find_first_of(pattern,0);
    while(index!=str.npos)
    {
        if(start!=index)
            ret.push_back(str.substr(start,index-start));
        start=index+1;
        index=str.find_first_of(pattern,start);
    }
    if(!str.substr(start).empty())
        ret.push_back(str.substr(start));
    return ret;
}