Hello,

1. message Foo's definition,
message Foo {
  extensions 100 to 199;
}

2. extension message Baz's definition,
message Baz {
  extend Foo {
    optional Baz foo_ext = 124;
  }
}

3. get the baz object's pointer by foo object use the MutableExtension() 
API,
Foo foo;
Baz* baz = foo.MutableExtension(Baz::foo_ext);
FillInMyBaz(baz);

But how to get the foo object by baz?

Best Regards,
Peter

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