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40 lines
838 B
Plaintext
40 lines
838 B
Plaintext
(deftype (Pair a b) [a a b b])
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(defmodule PairRef
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(defn = [p1 p2]
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(and (= (Pair.a p1) (Pair.a p2))
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(= (Pair.b p1) (Pair.b p2))))
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(defn /= [p1 p2]
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(not (PairRef.= p1 p2)))
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(defn < [p1 p2]
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(if (= (Pair.a p1) (Pair.a p2))
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(< (Pair.b p1) (Pair.b p2))
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(< (Pair.a p1) (Pair.a p2))))
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(defn > [p1 p2]
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(PairRef.< p2 p1)))
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(defmodule Pair
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(defn init-from-refs [r1 r2]
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(Pair.init @r1 @r2))
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(defn = [p1 p2]
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(and (= (Pair.a &p1) (Pair.a &p2))
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(= (Pair.b &p1) (Pair.b &p2))))
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(defn /= [p1 p2]
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(not (Pair.= p1 p2)))
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(defn < [p1 p2]
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(PairRef.< &p1 &p2))
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(defn > [p1 p2]
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(PairRef.> &p1 &p2))
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(doc reverse "reverses a `Pair` `p` such that its first member is its second member and vice versa.")
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(defn reverse [p]
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(Pair.init @(Pair.b p) @(Pair.a p)))
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)
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