flatbuffers/tests/bigfoot_ref_test_impl.h

#ifndef BIGFOOT_REF_TEST_IMPL_H
#define BIGFOOT_REF_TEST_IMPL_H

#include <cstdint>

namespace Native {
// Stands in for Bigfoot's real UUID.
struct RefId {
  uint64_t value;

  RefId() : value(0) {}
  explicit RefId(uint64_t _value) : value(_value) {}

  bool operator==(const RefId& other) const { return value == other.value; }
};

// `Thing`/`OtherThing` are intentionally *never* defined anywhere in this
// test (see bigfoot_ref_test.fbs) - Ref<T> must compile and round-trip
// without T ever being a complete type, exactly like Bigfoot's
// HardReference<T>/SoftReference<T>. Their forward declarations are emitted
// automatically by flatc (GenerateBigfootRefForwardDecls in
// idl_gen_cpp.cpp) directly into bigfoot_ref_test_generated.h - no manual
// forward declaration belongs here.

// The reference-wrapper template `bigfoot_ref_wrapper`/`bigfoot_ref` (see
// idl_parser.cpp/idl_gen_cpp.cpp) instantiate per referenced type. Only
// needs a `GetUUID()` accessor and a constructor from RefId - never needs T
// complete.
template <typename T>
struct Ref {
  RefId uuid;

  Ref() : uuid() {}
  Ref(const RefId& _uuid) : uuid(_uuid) {}

  const RefId& GetUUID() const { return uuid; }

  bool operator==(const Ref& other) const { return uuid == other.uuid; }
};
}  // namespace Native

namespace BigfootRefTestNS {
struct RefId;
}  // namespace BigfootRefTestNS

namespace flatbuffers {
BigfootRefTestNS::RefId Pack(const Native::RefId& obj);
const Native::RefId UnPack(const BigfootRefTestNS::RefId& obj);

namespace tests {
void BigfootRefTest();
}  // namespace tests
}  // namespace flatbuffers

#endif  // BIGFOOT_REF_TEST_IMPL_H