Is std::cout buffered?

by

Yes, it’s buffered:

C++11 27.4.2 [narrow.stream.objects]/3
: The object cout controls output to a stream buffer associated with the object stdout

The article refers to a 1995 draft version of what became the C++98 standard. I’ve no idea whether or not that might have said something different.

As for point 2, unitbuf is initially false on all streams (specified by the post-conditions of the basic_ios constructor), except for cerr and wcerr which explicitly specify otherwise. Again, that may well be different in the ancient draft being referred to.

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