c3948cba24
This PR upstreams the definition of `Vector` from Batteries, along with the basic functions.
7 lines
323 B
Text
7 lines
323 B
Text
inductive Vector' (α : Type u): Nat → Type u where
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| nil : Vector' α 0
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| cons (head : α) (tail : Vector' α n) : Vector' α (n+1)
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def Vector'.nth : ∀{n}, Vector' α n → Fin n → α
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| n+1, Vector'.cons x xs, ⟨ 0, _⟩ => x
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| n+1, Vector'.cons x xs, ⟨k+1, h⟩ => xs.nth ⟨k, Nat.lt_of_add_lt_add_right h⟩
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