feat(Tester): add tools to access private data

tester/tools/tester.h

+/*
+ * tester.h
+ * Copyright (C) 2010-2017 Belledonne Communications SARL
+ *
+ * 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.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _TESTER_H_
+#define _TESTER_H_
+
+#include <utility>
+
+#include "utils/utils.h"
+
+// =============================================================================
+
+// -----------------------------------------------------------------------------
+// Internal.
+// -----------------------------------------------------------------------------
+
+LINPHONE_BEGIN_NAMESPACE
+
+class Tester {
+public:
+	template<typename Object>
+	static constexpr decltype(std::declval<Object>().getPrivate()) getPrivate (Object *cppObject) {
+		return cppObject->getPrivate();
+	}
+
+private:
+	L_DISABLE_COPY(Tester);
+};
+
+LINPHONE_END_NAMESPACE
+
+// -----------------------------------------------------------------------------
+// Public.
+// -----------------------------------------------------------------------------
+
+#define L_GET_PRIVATE(OBJECT) \
+	LinphonePrivate::Tester::getPrivate(LinphonePrivate::Utils::getPtr(OBJECT))
+
+#endif // ifndef _TESTER_H_