package type_eq

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package type_eq
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Module Type_eqSource

Sourcetype ('a, 'b) t =
  1. | Eq : ('a, 'a) t

Represents equality between two types 'a, 'b. The constraint means that, if you have an instance of Eq, 'a and 'b are the same type

Sourceval coerce : ('a, 'b) t -> 'a -> 'b

coerce eq a applies equality proof eq on a value of type 'a to coerce it to 'b

Sourceval commute : ('a, 'b) t -> ('b, 'a) t

commute eq uses the commutative property of equality to produce a proof of equality from 'b to 'a from a proof from 'a to 'b

Sourceval transit : ('a, 'b) t -> ('b, 'c) t -> ('a, 'c) t

transit eq_a eq_b uses the transitive property of equality to produce a proof of equality from 'a to 'c from proofs from 'a to 'b and 'b to 'c

Sourceval val_equal : ?equal:('a -> 'a -> bool) -> ('a, 'b) t -> 'a -> 'b -> bool

val_equal ?equal eq a b returns equal a b after casting a to 'b.

?equal is ( = ) by default

Sourcemodule Lift (M : sig ... end) : sig ... end