Commit 2ed8bac2 authored by Robbert Krebbers's avatar Robbert Krebbers
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CMRAIdentity instance for option.

parent 1fa70657
......@@ -63,6 +63,7 @@ Context {A : cmraT}.
Instance option_validN : ValidN (option A) := λ n mx,
match mx with Some x => {n} x | None => True end.
Global Instance option_empty : Empty (option A) := None.
Instance option_unit : Unit (option A) := fmap unit.
Instance option_op : Op (option A) := union_with (λ x y, Some (x y)).
Instance option_minus : Minus (option A) :=
......@@ -125,6 +126,8 @@ Proof.
Canonical Structure optionRA :=
CMRAT option_cofe_mixin option_cmra_mixin option_cmra_extend_mixin.
Global Instance option_cmra_identity : CMRAIdentity optionRA.
Proof. split. done. by intros []. by inversion_clear 1. Qed.
Lemma op_is_Some mx my : is_Some (mx my) is_Some mx is_Some my.
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