Operand - modelint/types GitHub Wiki

An Operator may take any number of values. For example, the increment operator on a Counter User Type takes no Parameters.

In an action language like Scrall we might see:

area.Impacts.inc  // increment the value of the Impacts attribute of the area instance

Here we would assume that the Impacts attribute was typed as Counter and that the inc operator was invoked. In this case, no Parameters are required.

Let's say that we want to compute the distance between two Waypoints.

Again, in Scrall, we might see:

distance = Position - destination.Position

Here we may have typed Position as GPS Coordinate. On GPS Coordinate we define an operator named subtract(Position). It takes one un-named Parameter and is associated with a function that computes the distance to that other waypoint.

By overriding the subtract operator with distance computations, we are able to interpret the minus sign as a type specific operator invocation.

Identifiers

1. Position + Operator + Type

Attributes

Position

Type: Ordinal("Operand")