stream function output to other stream

[peterbaaij]

Hello, maybe someone can help me with this, i hope.
I'd like to have a function which can stream it's output to an other stream. In the code i have an example function.
Next in my main i'd have a line of code whith console output where i'm calling that function. So:

void teststream()
{
  std::string testtext = "Hello";
  for ( int i=0; i<testtext.size(); i++)
  {
    std::cout(???) << testtext.c_str()[i];
  } 
}

//Later
std::cout << "Here comes some data: " << teststream();

The question is, can i connect, rederict or pipe the output of teststream(): std::cout(???) to std::cout in the main function line? And if so, how am i going about?

[SamuelAdams]

create a global string variable and you can call it from any function.

[jlb]

Perhaps std::ios::tie()?

http://en.cppreference.com/w/cpp/io/basic_ios/tie