// Protocol Buffers - Google's data interchange format

// Copyright 2023 Google Inc.  All rights reserved.

//

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file or at

// https://developers.google.com/open-source/licenses/bsd

#ifndef GOOGLE_PROTOBUF_INTERNAL_VISIBILITY_H__

#define GOOGLE_PROTOBUF_INTERNAL_VISIBILITY_H__

namespace google {

namespace protobuf {

class Arena;

class Message;

class MessageLite;

namespace internal {

class InternalVisibilityForTesting;

class InternalMetadata;

// Empty class to use as a mandatory 'internal token' for functions that have to

// be public, such as arena constructors, but that are for internal use only.

class InternalVisibility {

 private:

  // Note: we don't use `InternalVisibility() = default` here, but default the

  // ctor outside of the class to force a private ctor instance.

  explicit constexpr InternalVisibility();

  friend class ::google::protobuf::Arena;

  friend class ::google::protobuf::Message;

  friend class ::google::protobuf::MessageLite;

  friend class ::google::protobuf::internal::InternalMetadata;

  friend class InternalVisibilityForTesting;

};

inline constexpr InternalVisibility::InternalVisibility() = default;

}  // namespace internal

}  // namespace protobuf

}  // namespace google

#endif  // GOOGLE_PROTOBUF_INTERNAL_VISIBILITY_H__