ceph/src/boost/libs/intrusive/include/boost/intrusive/detail/size_holder.hpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2014-2014
   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_DETAIL_SIZE_HOLDER_HPP
  14 #define BOOST_INTRUSIVE_DETAIL_SIZE_HOLDER_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 <boost/intrusive/detail/workaround.hpp>
  25
  26 namespace boost {
  27 namespace intrusive {
  28 namespace detail {
  29
  30 template<bool ConstantSize, class SizeType, class Tag = void>
  31 struct size_holder
  32 {
  33    static const bool constant_time_size = ConstantSize;
  34    typedef SizeType  size_type;
  35
  36    BOOST_INTRUSIVE_FORCEINLINE SizeType get_size() const
  37    {  return size_;  }
  38
  39    BOOST_INTRUSIVE_FORCEINLINE void set_size(SizeType size)
  40    {  size_ = size; }
  41
  42    BOOST_INTRUSIVE_FORCEINLINE void decrement()
  43    {  --size_; }
  44
  45    BOOST_INTRUSIVE_FORCEINLINE void increment()
  46    {  ++size_; }
  47
  48    BOOST_INTRUSIVE_FORCEINLINE void increase(SizeType n)
  49    {  size_ += n; }
  50
  51    BOOST_INTRUSIVE_FORCEINLINE void decrease(SizeType n)
  52    {  size_ -= n; }
  53
  54    BOOST_INTRUSIVE_FORCEINLINE void swap(size_holder &other)
  55    {  SizeType tmp(size_); size_ = other.size_; other.size_ = tmp; }
  56
  57    SizeType size_;
  58 };
  59
  60 template<class SizeType, class Tag>
  61 struct size_holder<false, SizeType, Tag>
  62 {
  63    static const bool constant_time_size = false;
  64    typedef SizeType  size_type;
  65
  66    BOOST_INTRUSIVE_FORCEINLINE size_type get_size() const
  67    {  return 0;  }
  68
  69    BOOST_INTRUSIVE_FORCEINLINE void set_size(size_type)
  70    {}
  71
  72    BOOST_INTRUSIVE_FORCEINLINE void decrement()
  73    {}
  74
  75    BOOST_INTRUSIVE_FORCEINLINE void increment()
  76    {}
  77
  78    BOOST_INTRUSIVE_FORCEINLINE void increase(SizeType)
  79    {}
  80
  81    BOOST_INTRUSIVE_FORCEINLINE void decrease(SizeType)
  82    {}
  83
  84    BOOST_INTRUSIVE_FORCEINLINE void swap(size_holder){}
  85 };
  86
  87 }  //namespace detail{
  88 }  //namespace intrusive{
  89 }  //namespace boost{
  90
  91 #endif //BOOST_INTRUSIVE_DETAIL_SIZE_HOLDER_HPP