--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/misc/documentPointer.cc Sun Dec 22 20:45:56 2013 +0200
@@ -0,0 +1,67 @@
+/*
+ * LDForge: LDraw parts authoring CAD
+ * Copyright (C) 2013 Santeri Piippo
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "documentPointer.h"
+#include "../document.h"
+
+LDDocumentPointer::LDDocumentPointer() : m_Pointer (null) {}
+
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+LDDocumentPointer::LDDocumentPointer (LDDocument* ptr) :
+ m_Pointer (ptr)
+{ addReference ();
+}
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+LDDocumentPointer::LDDocumentPointer (const LDDocumentPointer& other) :
+ m_Pointer (other.getPointer())
+{ addReference ();
+}
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+LDDocumentPointer::~LDDocumentPointer()
+{ removeReference();
+}
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+void LDDocumentPointer::addReference()
+{ if (getPointer() != null)
+ getPointer()->addReference (this);
+}
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+void LDDocumentPointer::removeReference()
+{ if (getPointer() != null)
+ getPointer()->removeReference (this);
+}
+
+// =============================================================================
+// -----------------------------------------------------------------------------
+LDDocumentPointer& LDDocumentPointer::operator= (LDDocument* ptr)
+{ if (ptr != getPointer())
+ { removeReference();
+ setPointer (ptr);
+ addReference();
+ }
+}
\ No newline at end of file