Mercurial > gemma
view pkg/common/delta.go @ 5718:3d497077f888 uploadwg
Implemented direct file upload as alternative import method for WG.
For testing and data corrections it is useful to be able to import
waterway gauges data directly by uploading a xml file.
author | Sascha Wilde <wilde@sha-bang.de> |
---|---|
date | Thu, 18 Apr 2024 19:23:19 +0200 |
parents | 3bc15e38c7e8 |
children |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2024 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package common // Delta returns a function which returns its argument when called // the first time and the delta to the last call afterwards. func Delta() func(int64) int64 { var last int64 return func(x int64) (y int64) { y = x - last last = x return } } // InvDelta is the inverse function to Delta. A sequence of numbers // fed into the function generated by InvDelta restores // the values fed into the function generated by Delta. func InvDelta() func(int64) int64 { var last int64 return func(x int64) (y int64) { y = x + last last = y return } }