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 19971 days, 10 hours, 15 minutes ago.