cpp/io/manip/emit on flush

If actually points to a , toggles whether it emits (i.e., transmits data to the underlying stream buffer) when flushed: @1@ calls @2@ calls

Otherwise, these manipulators have no effect.

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

Return value
(reference to the stream after manipulation)