ceph/src/boost/boost/interprocess/detail/pointer_type.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2005-2012.
   4 // (C) Copyright Gennaro Prota 2003 - 2004.
   5 //
   6 // Distributed under the Boost Software License, Version 1.0.
   7 // (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10 // See http://www.boost.org/libs/interprocess for documentation.
  11 //
  12 //////////////////////////////////////////////////////////////////////////////
  13
  14 #ifndef BOOST_INTERPROCESS_DETAIL_POINTER_TYPE_HPP
  15 #define BOOST_INTERPROCESS_DETAIL_POINTER_TYPE_HPP
  16
  17 #ifndef BOOST_CONFIG_HPP
  18 #  include <boost/config.hpp>
  19 #endif
  20 #
  21 #if defined(BOOST_HAS_PRAGMA_ONCE)
  22 #  pragma once
  23 #endif
  24
  25 #include <boost/interprocess/detail/config_begin.hpp>
  26 #include <boost/interprocess/detail/workaround.hpp>
  27 #include <boost/interprocess/detail/type_traits.hpp>
  28
  29 namespace boost {
  30 namespace interprocess {
  31 namespace ipcdetail {
  32
  33 struct two {char _[2];};
  34
  35 namespace pointer_type_imp {
  36
  37 template <class U> static two  test(...);
  38 template <class U> static char test(typename U::pointer* = 0);
  39
  40 }  //namespace pointer_type_imp {
  41
  42 template <class T>
  43 struct has_pointer_type
  44 {
  45     static const bool value = sizeof(pointer_type_imp::test<T>(0)) == 1;
  46 };
  47
  48 namespace pointer_type_imp {
  49
  50 template <class T, class D, bool = has_pointer_type<D>::value>
  51 struct pointer_type
  52 {
  53     typedef typename D::pointer type;
  54 };
  55
  56 template <class T, class D>
  57 struct pointer_type<T, D, false>
  58 {
  59     typedef T* type;
  60 };
  61
  62 }  //namespace pointer_type_imp {
  63
  64 template <class T, class D>
  65 struct pointer_type
  66 {
  67     typedef typename pointer_type_imp::pointer_type<T,
  68         typename remove_reference<D>::type>::type type;
  69 };
  70
  71 }  //namespace ipcdetail {
  72 }  //namespace interprocess {
  73 }  //namespace boost {
  74
  75 #include <boost/interprocess/detail/config_end.hpp>
  76
  77 #endif   //#ifndef BOOST_INTERPROCESS_DETAIL_POINTER_TYPE_HPP
  78