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/usr/include/caf/exit_reason.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_EXIT_REASON_HPP
#define CAF_EXIT_REASON_HPP

#include <cstdint>

namespace caf {
namespace exit_reason {

/**
 * Indicates that the actor is still alive.
 */
static constexpr uint32_t not_exited = 0x00000;

/**
 * Indicates that an actor finished execution.
 */
static constexpr uint32_t normal = 0x00001;

/**
 * Indicates that an actor finished execution because of an unhandled exception.
 */
static constexpr uint32_t unhandled_exception = 0x00002;

/**
 * Indicates that the actor received an unexpected synchronous reply message.
 */
static constexpr uint32_t unhandled_sync_failure = 0x00004;

/**
 * Indicates that a synchronous message timed out.
 */
static constexpr uint32_t unhandled_sync_timeout = 0x00005;

/**
 * Indicates that the exit reason for this actor is unknown, i.e.,
 * the actor has been terminated and no longer exists.
 */
static constexpr uint32_t unknown = 0x00006;

/**
 * Indicates that an actor pool unexpectedly ran out of workers.
 */
static constexpr uint32_t out_of_workers = 0x00007;

/**
 * Indicates that the actor was forced to shutdown by a user-generated event.
 */
static constexpr uint32_t user_shutdown = 0x00010;

/**
 * Indicates that an actor finishied execution because a connection
 * to a remote link was closed unexpectedly.
 */
static constexpr uint32_t remote_link_unreachable = 0x00101;

/**
 * Any user defined exit reason should have a value greater or
 * equal to prevent collisions with default defined exit reasons.
 */
static constexpr uint32_t user_defined = 0x10000;

/**
 * Returns a string representation of given exit reason.
 */
const char* as_string(uint32_t value);

} // namespace exit_reason
} // namespace caf

#endif // CAF_EXIT_REASON_HPP