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Returns an indication of whether the task group which is currently executing inline on the current context is in the midst of an active cancellation (or will be shortly). Note that if there is no task group currently executing inline on the current context, false will be returned.
bool __cdecl is_current_task_group_canceling();
true if the task group which is currently executing is canceling, false otherwise
For more information, see Cancellation in the PPL
Header: ppl.h
Reference