Commit 1c8276cb authored by Robbert Krebbers's avatar Robbert Krebbers

More option properties.

parent 752d27aa
......@@ -45,6 +45,10 @@ Qed.
Canonical Structure optionC := CofeT option_cofe_mixin.
Global Instance Some_ne : Proper (dist n ==> dist n) (@Some A).
Proof. by constructor. Qed.
Global Instance is_Some_ne n : Proper (dist (S n) ==> iff) (@is_Some A).
Proof. inversion_clear 1; split; eauto. Qed.
Global Instance Some_dist_inj : Injective (dist n) (dist n) (@Some A).
Proof. by inversion_clear 1. Qed.
Global Instance None_timeless : Timeless (@None A).
Proof. inversion_clear 1; constructor. Qed.
Global Instance Some_timeless x : Timeless x Timeless (Some x).
......@@ -56,8 +60,7 @@ Arguments optionC : clear implicits.
Instance option_fmap_ne {A B : cofeT} (f : A B) n:
Proper (dist n ==> dist n) f Proper (dist n==>dist n) (fmap (M:=option) f).
Proof. by intros Hf; destruct 1; constructor; apply Hf. Qed.
Instance is_Some_ne `{A : cofeT} : Proper (dist (S n) ==> iff) (@is_Some A).
Proof. intros n; inversion_clear 1; split; eauto. Qed.
(* CMRA *)
Section cmra.
......@@ -95,6 +98,11 @@ Proof.
try (by exists my; destruct my; constructor).
by exists (Some z); constructor.
Lemma None_includedN n (mx : option A) : None {n} mx.
Proof. rewrite option_includedN; auto. Qed.
Lemma Some_Some_includedN n (x y : A) : x {n} y Some x {n} Some y.
Proof. rewrite option_includedN; eauto 10. Qed.
Definition option_cmra_mixin : CMRAMixin (option A).
......@@ -138,6 +146,10 @@ Qed.
Canonical Structure optionRA :=
CMRAT option_cofe_mixin option_cmra_mixin option_cmra_extend_mixin.
Lemma op_is_Some x y : is_Some (x y) is_Some x is_Some y.
destruct x, y; rewrite /op /option_op /= -!not_eq_None_Some; naive_solver.
Lemma option_op_positive_dist_l n x y : x y ={n}= None x ={n}= None.
Proof. by destruct x, y; inversion_clear 1. Qed.
Lemma option_op_positive_dist_r n x y : x y ={n}= None y ={n}= None.
......@@ -107,6 +107,8 @@ Section setoids.
Lemma equiv_Some (mx my : option A) x :
mx my mx = Some x y, my = Some y x y.
Proof. destruct 1; naive_solver. Qed.
Global Instance is_Some_proper : Proper (() ==> iff) (@is_Some A).
Proof. inversion_clear 1; split; eauto. Qed.
End setoids.
(** Equality on [option] is decidable. *)
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