1 files changed, 236 insertions, 0 deletions
diff --git a/src/debug/event-tracker.h b/src/debug/event-tracker.h
new file mode 100644
index 0000000..a728bac
--- /dev/null
+++ b/src/debug/event-tracker.h
@@ -0,0 +1,236 @@
+// 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>
+    inline void set() {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>();
+        _active = true;
+    }
+
+    template <typename EventType, typename A>
+    inline void set(A const &a) {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B>
+    inline void set(A const &a, B const &b) {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B, typename C>
+    inline void set(A const &a, B const &b, C const &c) {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B,
+                                  typename C, typename D>
+    inline void set(A const &a, B const &b, C const &c, D const &d) {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c, d);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B, typename C,
+                                  typename D, typename E>
+    inline void set(A const &a, B const &b, C const &c, D const &d, E const &e)
+    {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c, d, e);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B, typename C,
+                                  typename D, typename E, typename F>
+    inline void set(A const &a, B const &b, C const &c,
+                    D const &d, E const &e, F const &f)
+    {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c, d, e, f);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B, typename C,
+                                  typename D, typename E, typename F,
+                                  typename G>
+    inline void set(A const &a, B const &b, C const &c, D const &d,
+                    E const &e, F const &f, G const &g)
+    {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c, d, e, f, g);
+        _active = true;
+    }
+
+    template <typename EventType, typename A, typename B, typename C,
+                                  typename D, typename E, typename F,
+                                  typename G, typename H>
+    inline void set(A const &a, B const &b, C const &c, D const &d,
+                    E const &e, F const &f, G const &g, H const &h)
+    {
+        if (_active) {
+            Logger::finish();
+        }
+        Logger::start<EventType>(a, b, c, d, e, f, g, h);
+        _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:
+    EventTracker() : EventTrackerBase(true) { Logger::start<EventType>(); }
+
+    template <typename A>
+    EventTracker(A const &a) : EventTrackerBase(true) {
+        Logger::start<EventType>(a);
+    }
+
+    template <typename A, typename B>
+    EventTracker(A const &a, B const &b) : EventTrackerBase(true) {
+        Logger::start<EventType>(a, b);
+    }
+
+    template <typename A, typename B, typename C>
+    EventTracker(A const &a, B const &b, C const &c) : EventTrackerBase(true) {
+        Logger::start<EventType>(a, b, c);
+    }
+
+    template <typename A, typename B, typename C, typename D>
+    EventTracker(A const &a, B const &b, C const &c, D const &d)
+    : EventTrackerBase(true)
+    {
+        Logger::start<EventType>(a, b, c, d);
+    }
+
+    template <typename A, typename B, typename C, typename D, typename E>
+    EventTracker(A const &a, B const &b, C const &c, D const &d, E const &e)
+    : EventTrackerBase(true)
+    {
+        Logger::start<EventType>(a, b, c, d, e);
+    }
+
+    template <typename A, typename B, typename C, typename D,
+              typename E, typename F>
+    EventTracker(A const &a, B const &b, C const &c, D const &d,
+                 E const &e, F const &f)
+    : EventTrackerBase(true)
+    {
+        Logger::start<EventType>(a, b, c, d, e, f);
+    }
+
+    template <typename A, typename B, typename C, typename D,
+              typename E, typename F, typename G>
+    EventTracker(A const &a, B const &b, C const &c, D const &d,
+                 E const &e, F const &f, G const &g)
+    : EventTrackerBase(true)
+    {
+        Logger::start<EventType>(a, b, c, d, e, f, g);
+    }
+
+    template <typename A, typename B, typename C, typename D,
+              typename E, typename F, typename G, typename H>
+    EventTracker(A const &a, B const &b, C const &c, D const &d,
+                 E const &e, F const &f, G const &g, H const &h)
+    : EventTrackerBase(true)
+    {
+        Logger::start<EventType>(a, b, c, d, e, f, g, h);
+    }
+};
+
+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 :