is_valid

Description:

public static bool is_valid (AsyncResult result, Object? source_object)

Checks that result is a Task, and that source_object is its source object (or that source_object is null and result has no source object).

This can be used in return_if_fail checks.

result	A AsyncResult
source_object	the source object expected to be associated with the task

true if result and source_object are valid, false if not