47 lines
1.5 KiB
Racket
47 lines
1.5 KiB
Racket
#lang racket
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;; (C) Copyright Collin J. Doering 2014
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;;
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;; File: comparable.rkt
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;; Author: Collin J. Doering <collin.doering@rekahsoft.ca>
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;; Date: Sep 11, 2014
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(require racket/generic)
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;; (provide (contract-out
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;; [bst-make-leaf (-> any bst-node?)]
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;; [bst-insert (-> bst-node? any)]))
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;; Define a generic interface for orderable things (thatis things that can be sorted)
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(define-generics orderable
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[lt orderable other]
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[lte orderable other]
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[gt orderable other]
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[gte orderable other]
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[eql orderable other]
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#:defaults ([number?
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(define lt <)
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(define lte <=)
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(define gt >)
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(define gte >=)
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(define eql =)]
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[string?
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(define lt string-ci<?)
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(define lte string-ci<=?)
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(define gt string-ci>?)
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(define gte string-ci>=?)
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(define eql equal?)]))
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