qapi: add QAPI dealloc visitor

Type of Visitor class that can be passed into a qapi-generated C
type's visitor function to free() any heap-allocated data types.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>

qapi/qapi-dealloc-visitor.h

@@ -0,0 +1,26 @@
+/*
+ * Dealloc Visitor
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Michael Roth   <mdroth@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QAPI_DEALLOC_VISITOR_H
+#define QAPI_DEALLOC_VISITOR_H
+
+#include "qapi-visit-core.h"
+
+typedef struct QapiDeallocVisitor QapiDeallocVisitor;
+
+QapiDeallocVisitor *qapi_dealloc_visitor_new(void);
+void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *d);
+
+Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v);
+
+#endif