mathlib3 documentation

core / init.meta.ref

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meta constant tactic.ref (α : Type u) :
Type u

A ref performs the role of a mutable variable within a tactic.

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meta constant tactic.using_new_ref {α : Type u} {β : Type v} (a : α) (t : tactic.ref α → tactic β) :
tactic β

Create a new reference r with initial value a, execute t r, and then delete r.

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meta constant tactic.read_ref {α : Type u} :
tactic.ref α → tactic α

Read the value stored in the given reference.

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meta constant tactic.write_ref {α : Type u} :
tactic.ref α → α → tactic unit

Update the value stored in the given reference.