C++中，怎么拼接 char字符串?

Cocos2d-x
#1

和PHP服务器通信，返回的数据 std::vector *buffer = response->getResponseData();
比如返回的一个用户名是xiaoMing,怎么把x i a o M i n g这几个拼接起来？C++不怎么熟啊！以前写JAVA的

#2

:10:
string temp;
for(auto itor:buffer){
temp += itor;
}
:868:

#3

strcat()
sprintf()
:7::7::7::7:

#4

std::string data( response->getResponseData()->begin(), response->getResponseData()->end());

#5 
    std::vector<char> *buffer = response->getResponseData();
    std::string str;
    for(unsigned int i = 0; i < buffer->size(); i++)
        str += (buffer->at(i));
#6

用血与泪的惨痛经历告诉你最好使用3楼的方法。