With one decode_field() switch per message, the three per wire type
content properties only differed in the attribute they read; a single
decode_content built from decode_expr() replaces them, and repeated
fields reuse the element type's expression. Case bodies with several
statements get their block from the body itself instead of a caller
flag, the fixed byte array body copies straight from the payload
instead of through a heap std::string, and the decode comments no
longer restate the switch keying explained next to the macros.
J. Nick Koston
e600180417