Mercurial > gemma
diff pkg/common/delta.go @ 5688:6281c18b109f sr-v2
Finsh serializing v2 meshes.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
---|---|
date | Mon, 12 Feb 2024 02:27:41 +0100 |
parents | |
children | 9e9cedae718a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/pkg/common/delta.go Mon Feb 12 02:27:41 2024 +0100 @@ -0,0 +1,32 @@ +// 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 + first := true + return func(x int64) (y int64) { + if first { + first = false + y = x + last = x + } else { + y = x - last + last = x + } + return + } +}