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qtprotobuf
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fieldenum
Glen Mabey 6bfcdfe8f9 working example of field enums 4 vuotta sitten
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README.md 6bfcdfe8f9 working example of field enums 4 vuotta sitten
field_enum_example.cpp 6bfcdfe8f9 working example of field enums 4 vuotta sitten
field_enum_example.pro 6bfcdfe8f9 working example of field enums 4 vuotta sitten
field_enum_example.proto 6bfcdfe8f9 working example of field enums 4 vuotta sitten

README.md

Field Number Enumerations

In protobuf3, fields are by default optional. When a field is not assigned (or, if it is not present in the version of the .proto file that the sender was using), a default value will be assigned to the field when it is deserialized by the message recipient. This, however, leads to an ambiguity as to whether the field was assigned a value which happened to be the default value, or whether it was not set at all by the sender.

Preceeding the invocation of protoc with QT_PROTOBUF_OPTIONS="FIELDENUM" results in additional enums being added to the .qpb.h files that are generated. These can be useful to indicate which fields were actually set when the message was created. This could be compared to setting a field to NULL in a SQL database.