protobuf/rust/test/cpp/interop/main.rs

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use std::ptr::NonNull;

macro_rules! assert_serializes_equally {
    ($msg:ident) => {{
        let mut msg = $msg;
        let serialized_cpp =
            unsafe { Serialize(msg.__unstable_cpp_repr_grant_permission_to_break()) };
        let serialized_rs = msg.serialize();

        assert_eq!(*serialized_rs, *serialized_cpp);
    }};
}

#[test]
fn mutate_message_in_cpp() {
    let mut msg = unittest_proto::TestAllTypes::new();
    unsafe { MutateInt64Field(msg.__unstable_cpp_repr_grant_permission_to_break()) };
    assert_serializes_equally!(msg);
}

#[test]
fn deserialize_message_in_rust() {
    let serialized = unsafe { SerializeMutatedInstance() };
    let mut msg = unittest_proto::TestAllTypes::new();
    msg.deserialize(&serialized).unwrap();
    assert_serializes_equally!(msg);
}

// Helper functions invoking C++ Protobuf APIs directly in C++. Defined in
// `//third_party/protobuf/rust/test/cpp/interop:test_utils`.
extern "C" {
    fn SerializeMutatedInstance() -> protobuf_cpp::SerializedData;
    fn MutateInt64Field(msg: NonNull<u8>);
    fn Serialize(msg: NonNull<u8>) -> protobuf_cpp::SerializedData;
}