C++ 字符串切割

std::vector<std::string> split(std::string str, std::string pattern)
{
    std::string::size_type pos;
    std::vector<std::string> result;
    str += pattern;//扩展字符串以方便操作  
    size_t size = str.size();
    for (int i = 0; i<int(size); i++)
    {
        pos = str.find(pattern, i);
        if (pos<size)
        {
            std::string s = str.substr(i, pos - i);
            result.push_back(s);
            i = pos + pattern.size() - 1;
        }
    }
    return result;
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