1 files changed, 97 insertions, 0 deletions
diff --git a/src/debug/event-tracker.h b/src/debug/event-tracker.h
new file mode 100644
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+++ b/src/debug/event-tracker.h
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Inkscape::Debug::EventTracker - semi-automatically track event lifetimes
+ *
+ * Authors:
+ *   MenTaLguY <mental@rydia.net>
+ *
+ * Copyright (C) 2005 MenTaLguY
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_DEBUG_EVENT_TRACKER_H
+#define SEEN_INKSCAPE_DEBUG_EVENT_TRACKER_H
+
+#include "debug/logger.h"
+
+namespace Inkscape {
+
+namespace Debug {
+
+#ifdef NDEBUG
+// Make event tracking a no-op for non-debug builds
+template <typename = void> struct EventTracker {
+    template <typename... Args> EventTracker(Args &&...) {}
+    template <typename, typename... Args> void set(Args &&...) {}
+    void clear() {}
+};
+#else
+
+struct NoInitialEvent {};
+
+template <typename Event=NoInitialEvent> class EventTracker;
+
+class EventTrackerBase {
+public:
+    virtual ~EventTrackerBase() {
+        if (_active) {
+            Logger::finish();
+        }
+    }
+
+    template <typename EventType, typename... Args>
+    inline void set(Args&&... args) {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(std::forward<Args>(args)...);
+        _active = true;
+    }
+
+    void clear() {
+        if (_active) {
+            Logger::finish();
+            _active = false;
+        }
+    }
+
+protected:
+    EventTrackerBase(bool active) : _active(active) {}
+
+private:
+    EventTrackerBase(EventTrackerBase const &) = delete; // no copy
+    void operator=(EventTrackerBase const &) = delete; // no assign
+    bool _active;
+};
+
+template <typename EventType> class EventTracker : public EventTrackerBase {
+public:
+    template <typename... Args>
+    EventTracker(Args&&... args) : EventTrackerBase(true) {
+        Logger::start<EventType>(std::forward<Args>(args)...);
+    }
+};
+
+template <> class EventTracker<NoInitialEvent> : public EventTrackerBase {
+public:
+    EventTracker() : EventTrackerBase(false) {}
+};
+
+#endif
+
+}
+
+}
+
+#endif
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :