Event callback function type
Member function type for callback functions to be registered with register_callback member function.
It is defined as a member function of ios_base as:
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typedef void (*event_callback) (event ev, ios_base& obj, int index);
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Therefore it is a function returning no value and having three parameters:
- ev
- The first parameter is an object of enum member type ios_base::event. When the callback function is called, this parameter is set to one of the three possible values to indicate what type of event triggered the function call.
- obj
- When the callback function is called, this parameter is a reference to the calling ios_base-derived object (*this).
- index
- When the callback function is called, this parameter is set to the same value used as the index argument when the function was registered with register_callback.
See also
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