The C++ function ios_base::event is used as the first parameter in functions registered with ios_base::register_callback. This argument identifies the type of event that triggered the function call.
DeclarationFollowing is the declaration for ios_base::event.
enum event;
Values of ios_event should be like this −
value event triggered copyfmt_event on a call to ios::copyfmt (at the moment where all format flags have been copied, but before the exception mask is) erase_event on a call to the stream destructor (also called at the beginning of ios::copyfmt). imbue_event on a call to ios_base::imbue (just before the function returns).This member enum type is defined within ios_base as −
enum event { erase_event, imbue_event, copyfmt_event };
ios.htm
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