Download or view simulatedOverload.frink in plain text format
// This program simulates operator overloading for adding objects.
class Rectangle
{
var width
var length
new[w,l] :=
{
width = w
length = l
}
getArea[] := width * length
}
class AreaObject
{
var area
new[a] := area = a
getArea[] := area
}
// Define transformation rule to add rectangles and create an AreaObject
// as a result.
//_a is Rectangle + _b is Rectangle <-> new AreaObject[_a.getArea[] + _b.getArea[]]
_a is Rectangle + _b is Rectangle <-> new AreaObject[_a.getArea[] + _b.getArea[]]
// Define another rule that adds a rectangle to an AreaObject. This allows
// an arbitrary number of Rectangles to be added together commutatively!
// The expression transformer also handles any ordering.
_a is Rectangle + _b is Rectangle + _c <-> new AreaObject[_a.getArea[] + _b.getArea[]] + _c
//_a is AreaObject + _b is Rectangle <-> new AreaObject[_a.getArea[] + _b.getArea[]]
x = new Rectangle[10 ft, 1 ft]
y = new Rectangle[100 ft, 20 ft]
z = new Rectangle[5 ft, 7 ft]
// This just gives an unevaluated Rectangle[] + Rectangle[]
println[x+y]
// This actually transforms and solves.
c = transformExpression[x+y]
println[c]
println[eval[c]]
// Try a commutative result
println[eval[transformExpression[x+y+z]]]
Download or view simulatedOverload.frink in plain text format
This is a program written in the programming language Frink.
For more information, view the Frink
Documentation or see More Sample Frink Programs.
Alan Eliasen was born 19965 days, 20 hours, 9 minutes ago.