Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
This is an I/O manipulator, it may be called with an expression such as out << std::unitbuf for any out of type std::basic_ostream or with an expression such as in >> std::unitbuf for any in of type std::basic_istream.
Flushing is performed in the destructor of the std::basic_ostream::sentry object, which calls str.rdbuf()->pubsync() if str.flags() & std::ios_base::unitbuf is true.
The standard output objects std::cerr and std::wcerr have their unitbuf bit set by default.
str (reference to the stream after manipulation).
[edit] ExampleWithout std::unitbuf or another explicit flush, the output is the same, but does not appear in real time.
Output:
571ms ... 1146ms ... 1722ms ... 2294ms ... 2865ms ...[edit] See also flushes the output stream
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