在C++中连接字符串流

如何连接两个字符串流？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include "types.h"    

int main () {
    char dest[1020] = "you";
    char source[7] = "baby";
    stringstream a,b;
    a << source;
    b << dest;
    a << b; /*HERE NEED CONCATENATE*/
    cout << a << endl;
    cout << a.str() << endl;
    return 0;
}

两次尝试的输出如下：

0xbf8cfd20
baby0xbf8cfddc

期望的输出是babyyou.

应该：

b << dest;
a << b.str();

stringstream::str返回底层字符串stringstream.