Mercurial > hg > svcore
diff base/ById.cpp @ 1729:abd8b9673028 by-id
Experiment toward working out an id-model store
author | Chris Cannam |
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date | Thu, 20 Jun 2019 14:57:39 +0100 (2019-06-20) |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/base/ById.cpp Thu Jun 20 14:57:39 2019 +0100 @@ -0,0 +1,33 @@ +/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ + +/* + Sonic Visualiser + An audio file viewer and annotation editor. + Centre for Digital Music, Queen Mary, University of London. + + 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 2 of the + License, or (at your option) any later version. See the file + COPYING included with this distribution for more information. +*/ + +#include "ById.h" + +#include <QMutex> + +#include <climits> + +int +WithId::getNextId() +{ + static int nextId = 0; + static QMutex mutex; + QMutexLocker locker(&mutex); + int i = nextId; + if (nextId == INT_MAX) { + nextId = INT_MIN; + } + ++nextId; + return i; +}