Parametric Types in Verse

Parametric types refer to any type that can take a parameter. You can use parametric types in Verse to define generalized data structures and operations. There are two ways to use parametric types as arguments: either in functions as explicit or implicit type arguments, or in classes as explicit type arguments.

Events are a common example of parametric types and are used extensively throughout devices in UEFN. For instance, the Button device has the InteractedWithEvent, which occurs whenever a player interacts with the button. To see a parametric type in action, check out the CountdownEndedEvent from the Custom Countdown Timer tutorial.

Explicit Type Arguments

Consider a box that takes two arguments. The first_item initializes an ItemOne, and the second_item initializes an ItemTwo, both of type type. Both first_item and second_item are examples of parametric types that are explicit arguments to a class.