protobuf/objectivec/Tests/unittest_cycle.proto

// Protocol Buffers - Google's data interchange format
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syntax = "proto2";

package objc.protobuf.tests.cycle;

option objc_class_prefix = "Cycle";

// Cycles in the Message graph can cause problems for message class
// initialization order.

// You can't make a object graph that spans files, so this can only be done
// within a single proto file.

message Foo {
  optional Foo a_foo = 1;
  optional Bar a_bar = 2;
  optional Baz a_baz = 3;
}

message Bar {
  optional Bar a_bar = 1;
  optional Baz a_baz = 2;
  optional Foo a_foo = 3;
}

message Baz {
  optional Baz a_baz = 1;
  optional Foo a_foo = 2;
  optional Bar a_bar = 3;
}