From Xojo Documentation
|You are currently browsing the old Xojo documentation site. Please visit the new Xojo documentation site!|
Used to overload the - operator, providing custom functionality. Operator_SubtractRight is the same as Operator_Subtract but the implicit Self instance is on the right instead of the left in the subtraction.
Create an Operator_SubtractRight function in a class to specify the functionality of the + operator for that class.
The ordinary (left) methods are always preferred; REALbasic uses the Right version only if there is no legal left version.
Suppose you have a class, Vector, that can store a vector. To define the - operator for this class, create a method of the Vector class called Operator_SubtractRight.
The Vector class has two integer properties, x and y.
Operator_SubtractRight is defined as:
Function Operator_SubtractRight (lhs as Vector) as Vector
//lhs stands for left-hand-side, the vector to be added to Self
ret.x=lhs.x + Self.x
ret.y=lhs.y + Self.y