OutputStreams and buffering

[Kat B]

I'd like some information, stored in a buffer, to be written to the file, when I call close() on the file.

I have looked at FileBuf and pubsetbuf, among others. However, after testing, they are not buffering it (the way I expect them to).

How can I achieve the same as BufferedOutputStream(Java) in C++?

[elega]

fprintf writes are buffered, but the OS may flush the buffer when deemed convenient. Writes to stderr are an exception and are not buffered.

If this bothers you, I suggest creating a secondary buffer, which you then write to the file and fflush().

[Kat B]

Thanks for that :)

[Galik]

What exactly is the behaviour you are/are not seeing? Are individual characters being written to the file with every write?

[moorecm]

Use a stringstream for buffering:
http://www.cplusplus.com/reference/iostream/stringstream/

#include <sstream>
//...
stringstream ss;
ss << "Buffered text";

Then send it to stdout with:

cout << ss.str();