package base

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package base
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type 'a t
type 'a elt
val fold : 'a t -> init:'accum -> f:('accum -> 'a elt -> 'accum) -> 'accum
val iter : [ `Define_using_fold | `Custom of 'a t -> f:('a elt -> unit) -> unit ]

The iter argument to Container.Make specifies how to implement the container's iter function. `Define_using_fold means to define iter via:

iter t ~f = Container.iter ~fold t ~f

`Custom overrides the default implementation, presumably with something more efficient. Several other functions returned by Container.Make are defined in terms of iter, so passing in a more efficient iter will improve their efficiency as well.

val length : [ `Define_using_fold | `Custom of 'a t -> int ]

The length argument to Container.Make specifies how to implement the container's length function. `Define_using_fold means to define length via:

length t ~f = Container.length ~fold t ~f

`Custom overrides the default implementation, presumably with something more efficient. Several other functions returned by Container.Make are defined in terms of length, so passing in a more efficient length will improve their efficiency as well.

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