39 lines
1.2 KiB
Text
39 lines
1.2 KiB
Text
/-
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Copyright (c) 2017 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Sebastian Ullrich
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-/
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prelude
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import init.meta.expr init.util
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@[reducible] meta def {u} has_reflect (α : Sort u) := Π a : α, reflected a
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section
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local attribute [semireducible] reflected
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meta instance nat.reflect : has_reflect ℕ
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| n := if n = 0 then `(0 : ℕ)
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else if n = 1 then `(1 : ℕ)
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else if n % 2 = 0 then `(bit0 %%(nat.reflect (n / 2)) : ℕ)
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else `(bit1 %%(nat.reflect (n / 2)) : ℕ)
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meta instance unsigned.reflect : has_reflect unsigned
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| ⟨n, pr⟩ := `(unsigned.of_nat' n)
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end
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/- Instances that [derive] depends on. All other basic instances are defined at the end of
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derive.lean. -/
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meta instance name.reflect : has_reflect name
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| name.anonymous := `(name.anonymous)
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| (name.mk_string s n) := `(λ n, name.mk_string s n).subst (name.reflect n)
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| (name.mk_numeral i n) := `(λ n, name.mk_numeral i n).subst (name.reflect n)
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meta instance list.reflect {α : Type} [has_reflect α] [reflected α] : has_reflect (list α)
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| [] := `([])
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| (h::t) := `(λ t, h :: t).subst (list.reflect t)
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meta instance unit.reflect : has_reflect unit
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| () := `(_)
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