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# == Rosetta Example: Polymorphism
# For details see https://rosettacode.org/wiki/Polymorphism
#
package req nx
package req nx::test
nx::Class create Point {
:property x:double
:property y:double
:public method print {} {
return "Point(${:x},${:y})"
}
}
nx::Class create Circle -superclass Point {
:property radius:double
:public method print {} {
return "Circle(${:x},${:y},${:radius})"
}
}
# === Demonstrating the behavior in a shell:
# Create a point and get the print string:
? {set p [Point new -x 1.0 -y 2.0]} "::nsf::__#0"
? {$p print} "Point(1.0,2.0)"
# Get the x coordinate of this point:
? {$p cget -x} "1.0"
# Create a circle:
? {set c [Circle new -x 3.0 -y 4.0 -radius 5.0]} "::nsf::__#1"
# Copy the circle
? {set d [$c copy]} "::nsf::__#3"
# Change the radius of the copied circle:
? {$d configure -radius 1.5} ""
# Print the two circles:
? {$c print} "Circle(3.0,4.0,5.0)"
? {$d print} "Circle(3.0,4.0,1.5)"
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