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91 lines
1.8 KiB
91 lines
1.8 KiB
(*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*)
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(** Singleton types for compare functions *)
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type ('a, 'compare_a) t = 'a -> 'a -> int
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module type S = sig
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type ('a, 'compare_a) comparer := ('a, 'compare_a) t
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type t
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type compare [@@deriving compare, equal, sexp]
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val comparer : (t, compare) comparer
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end
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module type S1 = sig
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type ('a, 'compare_a) comparer := ('a, 'compare_a) t
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type 'a t
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type 'compare_a compare [@@deriving compare, equal, sexp]
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val comparer :
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('a, 'compare_a) comparer -> ('a t, 'compare_a compare) comparer
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end
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module Make (Ord : sig
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type t [@@deriving compare]
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end) =
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struct
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include Ord
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type compare [@@deriving compare, equal, sexp]
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let comparer = Ord.compare
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end
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[@@inlined]
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module Counterfeit (Ord : sig
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type t [@@deriving compare]
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type compare [@@deriving compare, equal, sexp]
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end) =
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struct
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include Ord
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let comparer = Ord.compare
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end
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[@@inlined]
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module Apply (F : sig
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type ('a, 'compare_a) t [@@deriving compare]
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type 'compare_a compare [@@deriving compare, equal, sexp]
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end)
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(A : S) =
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struct
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module A = struct
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include A
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let compare = comparer
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end
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type t = (A.t, A.compare) F.t [@@deriving compare]
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type compare = A.compare F.compare [@@deriving compare, equal, sexp]
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let comparer = compare
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end
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[@@inlined]
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module Apply1 (F : sig
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type ('a, 'b, 'compare_a) t [@@deriving compare]
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type ('compare_a, 'compare_b) compare [@@deriving compare, equal, sexp]
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end)
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(A : S) =
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struct
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module A = struct
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include A
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let compare = comparer
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end
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type 'b t = (A.t, 'b, A.compare) F.t [@@deriving compare]
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type 'b compare = (A.compare, 'b) F.compare
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[@@deriving compare, equal, sexp]
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let comparer = compare
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end
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[@@inlined]
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