[Boost-users] [iostreams] Apply a filter temporarily - base64_encoder

Subject: [Boost-users] [iostreams] Apply a filter temporarily - base64_encoder
From: Fernando Pelliccioni (fpelliccioni_at_[hidden])
Date: 2011-10-21 19:34:56

Is there any way to apply a filter temporarily ?

I want to do this...

   io::filtering_ostream out;
   out.push_back(file_sink("my_file.txt"));

   out << "Authentication: ";

   out.push_front ( base64_encoder() );      // pseudo-code... see
*push_front* instead of *push*

   out << make_ntlm_auth_from_system();      // this have to be base64
encoded

   out.pop_front();                          // removes the base64_encoder

   out << "......";                          // *NO* base64 encoded

I don't want to do this...

   io::filtering_ostream out;
   out.push(file_sink("my_file.txt"));

   out << "Authentication: ";

   out.pop();

   out.push(base64_encoder());
   out.push(file_sink("my_file.txt"));

   out << make_ntlm_auth_from_system();

   out.pop();
   out.pop();

   out.push(file_sink("my_file.txt"));

   out << "......";

The function make_ntlm_auth_from_system() creates an object that is
*OStreamable*.

Any other suggestions are welcome. :)

Thanks and regards,
Fernando.