tree 65358f9f8195223ab89febfbb42347c7f3f289eb
parent cd85f19845cc96cc6e5269c894d8cd3c67e9ed83
author matloob@google.com <matloob@golang.org> 1464008944 -0400
committer matloob@google.com <matloob@golang.org> 1464008944 -0400

net/proto2: remove <message>.ExtensionMap() from generated messages

Turn generated message struct field XXX_Extensions map[int32]Extension
into an embedded proto.InternalExtensions  struct

InternalExtensions is a struct without any exported fields and methods.
This effectively makes the representation of the extension map private.
The proto package can access InternalExtensions by checking that the
generated struct has the method 'extmap() proto.InternalExtensions'.

Also lock accesses to the extension map.

This change bumps the Go protobuf generated code version number. Any
.pb.go files generated with this version of the proto package or later
will require this version or later of the proto package to compile.