ceph/src/boost/libs/intrusive/include/boost/intrusive/link_mode.hpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2006-2013
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // See http://www.boost.org/libs/intrusive for documentation.
  10 //
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef BOOST_INTRUSIVE_LINK_MODE_HPP
  14 #define BOOST_INTRUSIVE_LINK_MODE_HPP
  15
  16 #if defined(BOOST_HAS_PRAGMA_ONCE)
  17 #  pragma once
  18 #endif
  19
  20 namespace boost {
  21 namespace intrusive {
  22
  23 //!This enumeration defines the type of value_traits that can be defined
  24 //!for Boost.Intrusive containers
  25 enum link_mode_type{
  26    //!If this linking policy is specified in a value_traits class
  27    //!as the link_mode, containers
  28    //!configured with such value_traits won't set the hooks
  29    //!of the erased values to a default state. Containers also won't
  30    //!check that the hooks of the new values are default initialized.
  31    normal_link,
  32
  33    //!If this linking policy is specified in a value_traits class
  34    //!as the link_mode, containers
  35    //!configured with such value_traits will set the hooks
  36    //!of the erased values to a default state. Containers also will
  37    //!check that the hooks of the new values are default initialized.
  38    safe_link,
  39
  40    //!Same as "safe_link" but the user type is an auto-unlink
  41    //!type, so the containers with constant-time size features won't be
  42    //!compatible with value_traits configured with this policy.
  43    //!Containers also know that the a value can be silently erased from
  44    //!the container without using any function provided by the containers.
  45    auto_unlink
  46 };
  47
  48 #ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
  49
  50 template <link_mode_type link_mode>
  51 struct is_safe_autounlink
  52 {
  53    static const bool value =
  54       (int)link_mode == (int)auto_unlink   ||
  55       (int)link_mode == (int)safe_link;
  56 };
  57
  58 #endif   //BOOST_INTRUSIVE_DOXYGEN_INVOKED
  59
  60 } //namespace intrusive
  61 } //namespace boost
  62
  63 #endif //BOOST_INTRUSIVE_LINK_MODE_HPP