The Coq Proof Assistant

# Library Ltac2.Option

Require Import Ltac2.Init.
Require Import Ltac2.Control.
Ltac2 may (f : 'a -> unit) (ov : 'a option) :=
match ov with
| Some v => f v
| None => ()
end.
Ltac2 map (f : 'a -> 'b) (ov : 'a option) :=
match ov with
| Some v => Some (f v)
| None => None
end.
Ltac2 default (def : 'a) (ov : 'a option) :=
match ov with
| Some v => v
| None => def
end.
Ltac2 map_default (f : 'a -> 'b) (def : 'b) (ov : 'a option) :=
match ov with
| Some v => f v
| None => def
end.
Ltac2 get (ov : 'a option) :=
match ov with
| Some v => v
| None => Control.throw No_value
end.
Ltac2 get_bt (ov : 'a option) :=
match ov with
| Some v => v
| None => Control.zero No_value
end.
Ltac2 bind (x : 'a option) (f : 'a -> 'b option) :=
match x with
| Some x => f x
| None => None
end.
Ltac2 ret (x : 'a) := Some x.
Ltac2 lift (f : 'a -> 'b) (x : 'a option) := map f x.
Ltac2 equal (eq : 'a -> 'b -> bool) (a : 'a option) (b : 'b option) : bool
:= match a with
| None => match b with
| None => true
| _ => false
end
| Some a => match b with
| Some b => eq a b
| _ => false
end
end.