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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/io/manip/emit_on_flush.html below:

std::emit_on_flush, std::noemit_on_flush - cppreference.com

If os.rdbuf() actually points to a std::basic_syncbuf<CharT, Traits, Allocator> buf, toggles whether it emits (i.e., transmits data to the underlying stream buffer) when flushed:

1) calls buf.set_emit_on_sync(true)

2) calls buf.set_emit_on_sync(false)

Otherwise, these manipulators have no effect.

This is an output-only I/O manipulator, it may be called with an expression such as out << std::emit_on_flush for any out of type std::basic_ostream.

[edit] Parameters os - reference to output stream [edit] Return value

os (reference to the stream after manipulation)

[edit] Example [edit] See also changes the current emit-on-sync policy
(public member function of std::basic_syncbuf<CharT,Traits,Allocator>) [edit]

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