//===--- Ownership.h - Swift ASTs for Reference Ownership -------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file defines common structures for working with the different
// kinds of reference ownership supported by Swift, such as [weak] and
// [unowned].
//
//===----------------------------------------------------------------------===//

#ifndef SWIFT_OWNERSHIP_H
#define SWIFT_OWNERSHIP_H

namespace swift {

/// Different kinds of reference ownership supported by Swift.
enum class Ownership {
  /// \brief a strong reference (the default semantics)
  Strong,

  /// \brief a @weak reference
  Weak,

  /// \brief an @unowned reference
  Unowned,

  /// \brief an @unowned(unsafe) reference
  Unmanaged,
};
  
} // end namespace swift

#endif