Add a unique id to every dive

This id is just held in memory. It's not supposed to be used for anything
but having a unique handle that represents a dive. Whenever you need to
remember a dive across an operation that might change the dive_table, this
is what you should hold on to, not a dive number, a dive pointer, or
anything like that.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/qthelper.cpp b/qthelper.cpp
index 7eb1e48f4..9d503cb6a 100644
--- a/qthelper.cpp
+++ b/qthelper.cpp
@@ -217,3 +217,27 @@ QList< int > getDivesInTrip ( dive_trip_t* trip )
 	}
 	return ret;
 }
+
+// we need this to be uniq, but also make sure
+// it doesn't change during the life time of a Subsurface session
+// oh, and it has no meaning whatsoever - that's why we have the
+// silly initial number and increment by 3 :-)
+int getUniqID(struct dive *d)
+{
+	static QSet<int> ids;
+	static int maxId = 83529;
+
+	int id = d->id;
+	if (id) {
+		if (!ids.contains(id)) {
+			qDebug() << "WTF - only I am allowed to create IDs";
+			ids.insert(id);
+		}
+		return id;
+	}
+	maxId += 3;
+	id = maxId;
+	Q_ASSERT(!ids.contains(id));
+	ids.insert(id);
+	return id;
+}