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module Force_once

: sig
#
type 'a t

A "force_once" is a thunk that can only be forced once. Subsequent forces will raise an exception.

#
val create : (unit -> 'a) -> 'a t

create f creates a new force_once

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val force : 'a t -> 'a

force t runs the thunk if it hadn't already been forced, else it raises an exception.

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val ignore : unit -> unit t

ignore () = create (fun () -> ())

#
val sexp_of_t : ('a -> Sexplib.Sexp.t) -> 'a t -> Sexplib.Sexp.t
end