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1 structure Nat = |
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2 struct |
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3 |
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4 datatype nat = Dig1 of nat | Dig0 of nat | One_nat | Zero_nat; |
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5 |
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6 fun plus_nat (Dig1 m) (Dig1 n) = Dig0 (plus_nat (plus_nat m n) One_nat) |
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7 | plus_nat (Dig1 m) (Dig0 n) = Dig1 (plus_nat m n) |
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8 | plus_nat (Dig0 m) (Dig1 n) = Dig1 (plus_nat m n) |
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9 | plus_nat (Dig0 m) (Dig0 n) = Dig0 (plus_nat m n) |
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10 | plus_nat (Dig1 m) One_nat = Dig0 (plus_nat m One_nat) |
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11 | plus_nat One_nat (Dig1 n) = Dig0 (plus_nat n One_nat) |
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12 | plus_nat (Dig0 m) One_nat = Dig1 m |
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13 | plus_nat One_nat (Dig0 n) = Dig1 n |
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14 | plus_nat m Zero_nat = m |
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15 | plus_nat Zero_nat n = n; |
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16 |
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17 end; (*struct Nat*) |