Replace GC::Managed<>::clearOnceInaccessible with GC::soft_ptr<>

(bzr r241)

1 files changed, 74 insertions, 0 deletions

diff --git a/src/gc-soft-ptr.h b/src/gc-soft-ptr.h
new file mode 100644
index 000000000..a055ba38c
--- /dev/null
+++ b/src/gc-soft-ptr.h
@@ -0,0 +1,74 @@
+/** \file
+ * Inkscape::GC::soft_ptr - "soft" pointers to avoid finalization cycles
+ *
+ * Copyright 2006 MenTaLguY <mental@rydia.net>
+ *
+ * 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 for details.
+ *
+ */
+
+#ifndef SEEN_INKSCAPE_GC_SOFT_PTR_H
+#define SEEN_INKSCAPE_GC_SOFT_PTR_H
+
+#include "gc-core.h"
+
+namespace Inkscape {
+
+namespace GC {
+
+/** @brief A class for pointers which can be automatically cleared to break
+ *         finalization cycles.
+ */
+template <typename T>
+class soft_ptr {
+public:
+    soft_ptr(T * const &pointer=NULL) : _pointer(pointer) {
+        _register();
+    }
+    soft_ptr(soft_ptr const &other) : _pointer(other._pointer) {
+        _register();
+    }
+
+    operator T *() const { return _pointer; }
+    T &operator*() const { return *_pointer; }
+    T *operator->() const { return _pointer; } 
+    T &operator[](int i) const { return _pointer[i]; }
+
+    soft_ptr &operator=(T * const &pointer) {
+        _pointer = pointer;
+        return *this;
+    }
+
+    // default copy
+
+private:
+    void _register() {
+        void *base=Core::base(this);
+        if (base) {
+            Core::general_register_disappearing_link((void **)&_pointer, base);
+        }
+    }
+
+    T *_pointer;
+};
+
+}
+
+}
+
+#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:encoding=utf-8:textwidth=99 :