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+/* shared.h - internal tool for refcounting -*- c++ -*-
+ Copyright (C) 2003 Klarälvdalens Datakonsult AB
+
+ This file is part of GPGME++.
+
+ GPGME++ 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.
+
+ GPGME++ 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 GPGME; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef __GPGMEPP_SHARED_H__
+#define __GPGMEPP_SHARED_H__
+
+#include <cassert>
+
+namespace GpgME {
+
+ class Shared {
+ protected:
+ Shared() : mRefCount( 0 ) {}
+ virtual ~Shared() {
+ assert( mRefCount <= 0 );
+ }
+
+ public:
+ int ref() { return ++mRefCount; }
+ int deref() { return unref(); }
+ int unref() {
+ if ( --mRefCount <= 0 ) {
+ delete this;
+ return 0;
+ }
+ return mRefCount;
+ }
+ int refCount() { return mRefCount; }
+
+ private:
+ int mRefCount;
+ };
+
+}
+
+
+#endif // __GPGMEPP_SHARED_H__