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annotate pkg/common/delta.go @ 5736:55892008ec96 default tip

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Fixed a bunch of corner cases in WG import.
author Sascha Wilde <wilde@sha-bang.de>
date Wed, 29 May 2024 19:02:42 +0200
parents 3bc15e38c7e8
children
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2024 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package common
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15
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16 // Delta returns a function which returns its argument when called
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17 // the first time and the delta to the last call afterwards.
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18 func Delta() func(int64) int64 {
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19 var last int64
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20 return func(x int64) (y int64) {
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21 y = x - last
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22 last = x
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23 return
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24 }
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25 }
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26
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27 // InvDelta is the inverse function to Delta. A sequence of numbers
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28 // fed into the function generated by InvDelta restores
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29 // the values fed into the function generated by Delta.
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30 func InvDelta() func(int64) int64 {
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31 var last int64
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32 return func(x int64) (y int64) {
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33 y = x + last
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34 last = y
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35 return
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36 }
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37 }