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

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2005-2016.
   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/interprocess for documentation.
  10 //
  11 //////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef BOOST_INTERPROCESS_DETAIL_MPL_HPP
  14 #define BOOST_INTERPROCESS_DETAIL_MPL_HPP
  15
  16 #ifndef BOOST_CONFIG_HPP
  17 #  include <boost/config.hpp>
  18 #endif
  19 #
  20 #if defined(BOOST_HAS_PRAGMA_ONCE)
  21 #  pragma once
  22 #endif
  23
  24 #include <cstddef>
  25
  26 namespace boost {
  27 namespace interprocess {
  28 namespace ipcdetail {
  29
  30 template <class T, T val>
  31 struct integral_constant
  32 {
  33    static const T value = val;
  34    typedef integral_constant<T,val> type;
  35 };
  36
  37 template< bool C_ >
  38 struct bool_ : integral_constant<bool, C_>
  39 {
  40    static const bool value = C_;
  41 };
  42
  43 typedef bool_<true>        true_;
  44 typedef bool_<false>       false_;
  45
  46 typedef true_  true_type;
  47 typedef false_ false_type;
  48
  49 typedef char yes_type;
  50 struct no_type
  51 {
  52    char padding[8];
  53 };
  54
  55 template <bool B, class T = void>
  56 struct enable_if_c {
  57   typedef T type;
  58 };
  59
  60 template <class T>
  61 struct enable_if_c<false, T> {};
  62
  63 template <class Cond, class T = void>
  64 struct enable_if : public enable_if_c<Cond::value, T> {};
  65
  66 template <class Cond, class T = void>
  67 struct disable_if : public enable_if_c<!Cond::value, T> {};
  68
  69 template<
  70       bool C
  71     , typename T1
  72     , typename T2
  73     >
  74 struct if_c
  75 {
  76     typedef T1 type;
  77 };
  78
  79 template<
  80       typename T1
  81     , typename T2
  82     >
  83 struct if_c<false,T1,T2>
  84 {
  85     typedef T2 type;
  86 };
  87
  88 template<
  89       typename T1
  90     , typename T2
  91     , typename T3
  92     >
  93 struct if_
  94 {
  95    typedef typename if_c<0 != T1::value, T2, T3>::type type;
  96 };
  97
  98
  99 template<std::size_t S>
 100 struct ls_zeros
 101 {
 102    static const std::size_t value = (S & std::size_t(1)) ? 0 : (1u + ls_zeros<(S >> 1u)>::value);
 103 };
 104
 105 template<>
 106 struct ls_zeros<0>
 107 {
 108    static const std::size_t value = 0;
 109 };
 110
 111 template<>
 112 struct ls_zeros<1>
 113 {
 114    static const std::size_t value = 0;
 115 };
 116
 117 }  //namespace ipcdetail {
 118 }  //namespace interprocess {
 119 }  //namespace boost {
 120
 121 #endif   //#ifndef BOOST_INTERPROCESS_DETAIL_MPL_HPP
 122