1.4 KiB
1.4 KiB
[ios.base.callback]
31 Input/output library [input.output]
31.5 Iostreams base classes [iostreams.base]
31.5.2 Class ios_base [ios.base]
31.5.2.7 Callbacks [ios.base.callback]
void register_callback(event_callback fn, int idx);
Preconditions: The functionfn does not throw exceptions.
Effects: Registers the pair(fn, idx) such that during calls toimbue() ([ios.base.locales]),copyfmt(), or~ios_base() ([ios.base.cons]), the functionfn is called with argumentidx.
Functions registered are called when an event occurs, in opposite order of registration.
Functions registered while a callback function is active are not called until the next event.
Remarks: Identical pairs are not merged.
A function registered twice will be called twice.