summaryrefslogtreecommitdiffstats
path: root/libs/nanopb/examples/using_union_messages/unionproto.proto
diff options
context:
space:
mode:
Diffstat (limited to 'libs/nanopb/examples/using_union_messages/unionproto.proto')
-rw-r--r--libs/nanopb/examples/using_union_messages/unionproto.proto32
1 files changed, 32 insertions, 0 deletions
diff --git a/libs/nanopb/examples/using_union_messages/unionproto.proto b/libs/nanopb/examples/using_union_messages/unionproto.proto
new file mode 100644
index 00000000..209df0d2
--- /dev/null
+++ b/libs/nanopb/examples/using_union_messages/unionproto.proto
@@ -0,0 +1,32 @@
+// This is an example of how to handle 'union' style messages
+// with nanopb, without allocating memory for all the message types.
+//
+// There is no official type in Protocol Buffers for describing unions,
+// but they are commonly implemented by filling out exactly one of
+// several optional fields.
+
+syntax = "proto2";
+
+message MsgType1
+{
+ required int32 value = 1;
+}
+
+message MsgType2
+{
+ required bool value = 1;
+}
+
+message MsgType3
+{
+ required int32 value1 = 1;
+ required int32 value2 = 2;
+}
+
+message UnionMessage
+{
+ optional MsgType1 msg1 = 1;
+ optional MsgType2 msg2 = 2;
+ optional MsgType3 msg3 = 3;
+}
+