feat: Lean.RArray #6070
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feat: Lean.RArray #6070
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This PR adds the Lean.RArray data structure.
This data structure is equivalent to
Fin n → αorArray α, but optimized for a fast kernel-reductiongetoperation.It is not suitable as a general-purpose data structure. The primary intended use case is the “denote” function of a typical proof by reflection proof, where only the
getoperation is necessary, and where usingList.getunnecessarily slows down proofs with more than a hand-full of atomic expressions.There is no well-formedness invariant attached to this data structure, to keep it concise; it's semantics is given through
RArray.get. In that way one can also view anRArrayas a decision tree implementingNat → α.In #6068 this data structure is used in
simp_arith.