permutations.ss
#lang scheme

#|  permutations.ss: Export bindings from permutations-core.ss
    Copyright (C) 2008 Will M. Farr <farr@mit.edu>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
|#

(require "private/permutations-core.ss")

(provide :permutations in-permutations)

(provide/contract
 (permutation? (-> any/c boolean?))
 (permutation-identity (-> natural-number/c vector?))
 (pvector-ref (-> vector? vector? natural-number/c any))
 (pvector-set! (-> vector? vector? natural-number/c any/c any))
 (permutation-next! (-> vector? (or/c vector? false/c)))
 (permutation-next (-> vector? (or/c vector? false/c)))
 (permutation-signature (-> vector? (one-of/c -1 1))))