Any differences between proto2 and proto3 generated code are highlighted - note that these differences are in the generated code as described in this document, not the base message classes/interfaces, which are the same in both versions. You should read the proto2 language guide and/or proto3 language guide before reading this document. Compiler Invocation The protocol buffer compiler produces C++ output when invoked with the --cpp_out= command-line flag. The parameter to the --cpp_out= optio...
