1 files changed, 79 insertions, 0 deletions
diff --git a/canvas/source/null/null_usagecounter.hxx b/canvas/source/null/null_usagecounter.hxx
new file mode 100644
index 000000000000..3c70c5fd8792
--- /dev/null
+++ b/canvas/source/null/null_usagecounter.hxx
@@ -0,0 +1,79 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: null_usagecounter.hxx,v $
+ * $Revision: 1.3 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org 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 version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _NULLCANVAS_USAGECOUNTER_HXX
+#define _NULLCANVAS_USAGECOUNTER_HXX
+
+#include <osl/interlck.h>
+#include <boost/current_function.hpp>
+
+namespace nullcanvas
+{
+    /** Little resource tracking counter.
+
+        When using this object, a global use counter, specific to the
+        given type is incremented on object construction, and
+        decremented on object destruction.
+     */
+    template< class Type > class UsageCounter
+    {
+    public:
+        UsageCounter()
+        {
+            OSL_TRACE( "%s, %d objects currently in use.\n",
+                       BOOST_CURRENT_FUNCTION,
+                       osl_incrementInterlockedCount( &s_nCount ) );
+        }
+
+        ~UsageCounter()
+        {
+            const sal_Int32 nCount( osl_decrementInterlockedCount( &s_nCount ) );
+
+            if( !nCount )
+            {
+                OSL_TRACE( "%s, last instance deleted.\n",
+                           BOOST_CURRENT_FUNCTION );
+            }
+            else
+            {
+                OSL_TRACE( "%s, %d instances left.\n",
+                           BOOST_CURRENT_FUNCTION,
+                           nCount );
+            }
+        }
+
+    private:
+        static oslInterlockedCount s_nCount;
+    };
+
+    template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
+}
+
+#endif /* _NULLCANVAS_USAGECOUNTER_HXX */