diff options
Diffstat (limited to 'lib/util.mli')
| -rw-r--r-- | lib/util.mli | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/lib/util.mli b/lib/util.mli index 6bed7e35..1eb60f50 100644 --- a/lib/util.mli +++ b/lib/util.mli @@ -1,9 +1,11 @@ (************************************************************************) -(* v * The Coq Proof Assistant / The Coq Development Team *) -(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) (* \VV/ **************************************************************) -(* // * This file is distributed under the terms of the *) -(* * GNU Lesser General Public License Version 2.1 *) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) (************************************************************************) (** This module contains numerous utility functions on strings, lists, @@ -84,13 +86,17 @@ val matrix_transpose : 'a list list -> 'a list list val identity : 'a -> 'a -(** Function composition: the mathematical [∘] operator. +(** Left-to-right function composition: + + [f1 %> f2] is [fun x -> f2 (f1 x)]. - So [g % f] is a synonym for [fun x -> g (f x)]. + [f1 %> f2 %> f3] is [fun x -> f3 (f2 (f1 x))]. - Also because [%] is right-associative, [h % g % f] means [fun x -> h (g (f x))]. + [f1 %> f2 %> f3 %> f4] is [fun x -> f4 (f3 (f2 (f1 x)))] + + etc. *) -val (%) : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b +val ( %> ) : ('a -> 'b) -> ('b -> 'c) -> 'a -> 'c val const : 'a -> 'b -> 'a val iterate : ('a -> 'a) -> int -> 'a -> 'a @@ -129,5 +135,12 @@ type 'a until = 'a CSig.until = Stop of 'a | Cont of 'a type ('a, 'b) eq = ('a, 'b) CSig.eq = Refl : ('a, 'a) eq +val sym : ('a, 'b) eq -> ('b, 'a) eq + val open_utf8_file_in : string -> in_channel (** Open an utf-8 encoded file and skip the byte-order mark if any. *) + +val set_temporary_memory : unit -> ('a -> 'a) * (unit -> 'a) +(** A trick which can typically be used to store on the fly the + computation of values in the "when" clause of a "match" then + retrieve the evaluated result in the r.h.s of the clause *) |