[MLton-commit] r4959

[Vesa Karvonen]

Reorganized public files.
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D   mltonlib/trunk/com/ssh/extended-basis/unstable/public/tie.sig

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Deleted: mltonlib/trunk/com/ssh/extended-basis/unstable/public/tie.sig
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--- mltonlib/trunk/com/ssh/extended-basis/unstable/public/tie.sig	2006-12-10 19:16:30 UTC (rev 4958)
+++ mltonlib/trunk/com/ssh/extended-basis/unstable/public/tie.sig	2006-12-10 19:16:35 UTC (rev 4959)
@@ -1,89 +0,0 @@
-(* Copyright (C) 2006 SSH Communications Security, Helsinki, Finland
- *
- * This code is released under the MLton license, a BSD-style license.
- * See the LICENSE file or http://mlton.org/License for details.
- *)
-
-(**
- * A framework for computing fixpoints.
- *
- * In a strict language you sometimes want to provide a fixpoint
- * combinator for an abstract type {t} to make it possible to write
- * recursive definitions.  Unfortunately, a single combinator {fix} of the
- * type {(t -> t) -> t} does not support mutual recursion.  To support
- * mutual recursion, you would need to provide a family of fixpoint
- * combinators having types of the form {(u -> u) -> u} where {u} is a
- * type of the form {t * ... * t}.  Unfortunately, even such a family of
- * fixpoint combinators does not support mutual recursion over different
- * abstract types.
- *
- * See also: http://mlton.org/Fixpoints
- *)
-signature TIE = sig
-   type 'a t_domain
-   type 'a t_range
-   type 'a t = 'a t_domain -> 'a t_range
-   (**
-    * The type of fixpoint tiers.
-    *
-    * The type constructors {t_domain} and {t_range} are used to expose
-    * the arrow {->} type constructor (to allow eta-expansion) while
-    * preventing clients from actually applying tiers.
-    *)
-
-   val fix : 'a t -> 'a Fix.t
-   (**
-    * Produces a fixpoint combinator from the given tier.  For example,
-    * given a module {Fn} implementing a tier {Fn.Y} for functions, one
-    * could make a mutually recursive definition of functions:
-    *
-    *> val isEven & isOdd =
-    *>     let open Tie in fix (Fn *` Fn) end
-    *>        (fn isEven & isOdd =>
-    *>            (fn 0w0 => true
-    *>              | 0w1 => false
-    *>              | n => isOdd (n-0w1)) &
-    *>            (fn 0w0 => false
-    *>              | 0w1 => true
-    *>              | n => isEven (n-0w1)))
-    *)
-
-   val pure : ('a * 'a UnOp.t) Thunk.t -> 'a t
-   (**
-    * {pure} is a more general version of {tier}.  It is mostly useful for
-    * computing fixpoints in a non-imperative manner.
-    *)
-
-   val tier : ('a * 'a Effect.t) Thunk.t -> 'a t
-   (**
-    * {tier} is used to define fixpoint tiers for new abstract types by
-    * providing a thunk whose instantiation allocates a fresh "knot" and a
-    * procedure for "tying" it.
-    *)
-
-   val iso : 'b t -> ('a, 'b) Iso.t -> 'a t
-   (**
-    * Given an isomorphism between {'a} and {'b} and a tier for {'b},
-    * produces a tier for {'a}.  This is useful when you have a new type
-    * that is isomorphic to some old type for which you already have a
-    * tier.
-    *)
-
-   val *` : 'a t * 'b t -> ('a, 'b) Product.t t
-   (**
-    * Given tiers for {'a} and {'b} produces a tier for the product {('a,
-    * 'b) Product.t}.  This is used when mutual recursion is needed.
-    *)
-
-   val tuple2 : 'a t * 'b t -> ('a * 'b) t
-   (**
-    * Given tiers for {'a} and {'b} produces a tier for the product {'a *
-    * 'b}.
-    *)
-
-   val option : 'a Option.t t
-   (** Tier for options. *)
-
-   val function : ('a -> 'b) t
-   (** Tier for functions. *)
-end