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主题	描述
30.4.1 Traverse object	To access the value changes of an object over time, the notion of a Value Change (VC) traverse handle is added. A value change traverse object is used to traverse and access value changes not just for the current value (as calling vpi_get_time() or vpi_get_value() on the object handle would) but for any point in time: past, present, or future. To create a value change traverse handle the routine vpi_handle() is called with a vpiTrvsObj vpiType:
30.4.2 VPI collection	In order to read data efficiently, it can be necessary to specify a group of objects. For example, when traversing data a user might wish to specify a list of objects to be marked as targets of data traversal. To do this grouping requires the notion of a collection. A collection represents a user-defined collection of VPI handles. The collection is an ordered list of VPI handles. The vpiType of a collection handle can be vpiCollection, vpi-ObjCollection, or vpiTrvsCollection: A collection of type vpiCollection is a general collection of VPI handles of objects of any type. The collection object of... more