package travesty

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package travesty
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Generic output shape of filter-mappable structures on either an arity-0 or arity-1 type.

  • For arity-0 types, use S0: 'a t becomes t, and 'a elt becomes elt; - For arity-1 types, use S1: 'a t becomes 'a t, and 'a elt becomes 'a.

Generic strictly extends Generic_basic.

include Generic_basic

Generic_basic refers to the container type as 'a t, and the element type as 'a elt; substitute t/elt (arity-0) or 'a t/'a (arity-1) accordingly below.

include Types_intf.Generic
type 'a t

Placeholder for the container type.

type 'a elt

Placeholder for the type of elements inside the container.

val filter_map : 'a t -> f:('a elt -> 'b elt Base.option) -> 'b t

filter_map c ~f maps f over every t in c, discarding any items for which f returns None.

val filter : 'a t -> f:('a elt -> Base.bool) -> 'a t

filter c ~f checks f over every t in c, discarding any items for which f returns false.

val exclude : 'a t -> f:('a elt -> Base.bool) -> 'a t

exclude c ~f checks f over every t in c, discarding any items for which f returns true.

We can also derive Mappable interfaces from filter-mappable ones, but leave that to a separate functor.