18 lines
716 B
Text
18 lines
716 B
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: Leonardo de Moura
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-/
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prelude
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import init.meta.tactic
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universes u v
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namespace tactic
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meta constant ref (α : Type u) : Type u
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/-- Create a new reference `r` with initial value `a`, execute `t r`, and then delete `r`. -/
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meta constant using_new_ref {α : Type u} {β : Type v} (a : α) (t : ref α → tactic β) : tactic β
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/-- Read the value stored in the given reference. -/
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meta constant read_ref {α : Type u} : ref α → tactic α
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/-- Update the value stored in the given reference. -/
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meta constant write_ref {α : Type u} : ref α → α → tactic unit
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end tactic
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