38 lines
853 B
Nim
38 lines
853 B
Nim
type
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T = ref object of RootObj
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myValue: string
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S1 = ref object of T
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S2 = ref object of T
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method speak(x: T) {.base.} = echo "T Hello ", x.myValue
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method speak(x: S1) = echo "S1 Meow ", x.myValue
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method speak(x: S2) = echo "S2 Woof ", x.myValue
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echo "creating initial objects of types S1, S2, and T."
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var a = S1(myValue: "Green")
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a.speak
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var b = S2(myValue: "Blue")
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b.speak
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var u = T(myValue: "Blue")
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u.speak
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echo "Making copy of a as u; colors and types should match."
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u.deepCopy(a)
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u.speak
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a.speak
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echo "Assigning new color to u; A's color should be unchanged."
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u.myValue = "Orange"
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u.speak
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a.speak
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echo "Assigning u to reference same object as b; colors and types should match."
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u = b
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u.speak
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b.speak
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echo "Assigning new color to u. Since u,b reference the same object, b's color changes as well."
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u.myValue = "Yellow"
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u.speak
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b.speak
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