for Object Multiplex

[TimelifeCzy]

code:

std::vector<std::string> vec_task_string;
rapidjson::Document document;
document.SetObject();
rapidjson::StringBuffer buffer;
rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
for (xxx)
{
    buffer.Clear();
    writer.Reset(buffer);
    document.AddMember(rapidjson::StringRef("xxxxxx"), rapidjson::StringRef(tmpstr.c_str()), document.GetAllocator());
    document.Accept(writer);
    vec_task_string.push_back(buffer.GetString());
}

1. buffer.Clear(); --> invalid
2. writer.Reset(buffer); --> don't know if it's correct

need help thanks！