1 files changed, 124 insertions, 0 deletions
diff --git a/libs/sigc++2/sigc++/trackable.cc b/libs/sigc++2/sigc++/trackable.cc
new file mode 100644
index 0000000000..46e2592ffb
--- /dev/null
+++ b/libs/sigc++2/sigc++/trackable.cc
@@ -0,0 +1,124 @@
+// -*- c++ -*-
+/*
+ * Copyright 2002, The libsigc++ Development Team
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <sigc++/trackable.h>
+#include <iostream>
+using namespace std;
+
+namespace sigc
+{
+
+trackable::trackable()
+: callback_list_(0)
+{}
+
+/* Don't copy the notification list.
+   The objects watching src don't need to be notified when the new object dies. */
+trackable::trackable(const trackable& /*src*/)
+: callback_list_(0)
+{}
+
+trackable& trackable::operator=(const trackable& src)
+{
+  if(this != &src)
+    notify_callbacks(); //Make sure that we have finished with existing stuff before replacing it.
+  
+  return *this;
+}
+
+trackable::~trackable()
+{
+  notify_callbacks();
+}
+
+void trackable::add_destroy_notify_callback(void* data, func_destroy_notify func) const
+{
+  callback_list()->add_callback(data, func);
+}
+
+void trackable::remove_destroy_notify_callback(void* data) const
+{
+  callback_list()->remove_callback(data);
+}
+
+void trackable::notify_callbacks()
+{
+  if (callback_list_)
+    delete callback_list_; //This invokes all of the callbacks.
+
+  callback_list_ = 0;
+}
+
+internal::trackable_callback_list* trackable::callback_list() const
+{
+  if (!callback_list_)
+    callback_list_ = new internal::trackable_callback_list;
+
+  return callback_list_;
+}
+
+      
+namespace internal
+{
+
+trackable_callback_list::~trackable_callback_list()
+{
+  clearing_ = true;
+
+  for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
+    (*i).func_((*i).data_);
+}
+
+void trackable_callback_list::add_callback(void* data, func_destroy_notify func)
+{
+  if (!clearing_)  // TODO: Is it okay to silently ignore attempts to add dependencies when the list is being cleared?
+                   //       I'd consider this a serious application bug, since the app is likely to segfault.
+                   //       But then, how should we handle it? Throw an exception? Martin.
+    callbacks_.push_back(trackable_callback(data, func));
+}
+
+void trackable_callback_list::clear()
+{
+  clearing_ = true;
+
+  for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
+    (*i).func_((*i).data_);
+
+  callbacks_.clear();
+
+  clearing_ = false;
+}
+
+void trackable_callback_list::remove_callback(void* data)
+{
+  if (clearing_) return; // No circular notices
+
+  for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
+    if ((*i).data_ == data)
+    {
+      callbacks_.erase(i);
+      return;
+    }
+}
+
+} /* namespace internal */
+
+
+} /* namespace sigc */