diff base/ById.cpp @ 1729:abd8b9673028 by-id

Experiment toward working out an id-model store

--- /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;
+}