| // 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. |
| |
| 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; |
| } |
| |
