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/usr/include/caf/io/handle.hpp is in libcaf-dev 0.13.2-3.

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/******************************************************************************
 *                       ____    _    _____                                   *
 *                      / ___|  / \  |  ___|    C++                           *
 *                     | |     / _ \ | |_       Actor                         *
 *                     | |___ / ___ \|  _|      Framework                     *
 *                      \____/_/   \_|_|                                      *
 *                                                                            *
 * Copyright (C) 2011 - 2015                                                  *
 * Dominik Charousset <dominik.charousset (at) haw-hamburg.de>                *
 *                                                                            *
 * Distributed under the terms and conditions of the BSD 3-Clause License or  *
 * (at your option) under the terms and conditions of the Boost Software      *
 * License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE.       *
 *                                                                            *
 * If you did not receive a copy of the license files, see                    *
 * http://opensource.org/licenses/BSD-3-Clause and                            *
 * http://www.boost.org/LICENSE_1_0.txt.                                      *
 ******************************************************************************/

#ifndef CAF_DETAIL_HANDLE_HPP
#define CAF_DETAIL_HANDLE_HPP

#include <cstdint>

#include "caf/detail/comparable.hpp"

namespace caf {

/**
 * Base class for IO handles such as `accept_handle` or `connection_handle`.
 */
template <class Subtype, int64_t InvalidId = -1>
class handle : detail::comparable<Subtype> {
 public:
  constexpr handle() : m_id{InvalidId} {
    // nop
  }

  handle(const Subtype& other) {
    m_id = other.id(); 
  }

  handle(const handle& other) = default;

  Subtype& operator=(const handle& other) {
    m_id = other.id();
    return *static_cast<Subtype*>(this);
  }

  /**
   * Returns the unique identifier of this handle.
   */
  int64_t id() const {
    return m_id; 
  }

  /**
   * Sets the unique identifier of this handle.
   */
  void set_id(int64_t value) {
    m_id = value;
  }

  int64_t compare(const Subtype& other) const {
    return m_id - other.id();
  }

  bool invalid() const { 
    return m_id == InvalidId;
  }

  void set_invalid() {
    set_id(InvalidId);
  }

  static Subtype from_int(int64_t id) {
    return {id};
  }

 protected:
  handle(int64_t handle_id) : m_id{handle_id} {
    // nop
  }

 private:
  int64_t m_id;
};

} // namespace caf

#endif // CAF_DETAIL_HANDLE_HPP