Unit test of encoding functions returning an int

include/zenoh/net/private/codec.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2017, 2020 ADLINK Technology Inc.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+ * which is available at https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+ *
+ * Contributors:
+ *   ADLINK zenoh team, <zenoh@adlink-labs.tech>
+ */
+
+#ifndef ZENOH_C_NET_PRIVATE_CODEC_H
+#define ZENOH_C_NET_PRIVATE_CODEC_H
+
+#define _ZN_EC(fn) \
+    if (fn != 0)   \
+    {              \
+        return -1; \
+    }
+
+#endif /* ZENOH_C_NET_PRIVATE_CODEC_H */