ceph/src/boost/libs/interprocess/include/boost/interprocess/sync/shm/named_creation_functor.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2007-2012. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/interprocess for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP
  12 #define BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP
  13
  14 #ifndef BOOST_CONFIG_HPP
  15 #  include <boost/config.hpp>
  16 #endif
  17 #
  18 #if defined(BOOST_HAS_PRAGMA_ONCE)
  19 #  pragma once
  20 #endif
  21
  22 #include <boost/interprocess/creation_tags.hpp>
  23 #include <boost/interprocess/detail/type_traits.hpp>
  24 #include <boost/interprocess/detail/mpl.hpp>
  25 #include <boost/container/detail/placement_new.hpp>
  26
  27 namespace boost {
  28 namespace interprocess {
  29 namespace ipcdetail {
  30
  31 struct named_creation_functor_no_arg{};
  32
  33 template <class T, class Arg = named_creation_functor_no_arg>
  34 class named_creation_functor
  35 {
  36    typedef named_creation_functor_no_arg no_arg_t;
  37    public:
  38    named_creation_functor(create_enum_t type, Arg arg = Arg())
  39       :  m_creation_type(type), m_arg(arg){}
  40
  41    template<class ArgType>
  42    void construct(void *address, typename enable_if_c<is_same<ArgType, no_arg_t>::value>::type * = 0) const
  43    {  ::new(address, boost_container_new_t())T; }
  44
  45    template<class ArgType>
  46    void construct(void *address, typename enable_if_c<!is_same<ArgType, no_arg_t>::value>::type * = 0) const
  47    {  ::new(address, boost_container_new_t())T(m_arg); }
  48
  49    bool operator()(void *address, std::size_t, bool created) const
  50    {
  51       switch(m_creation_type){
  52          case DoOpen:
  53             return true;
  54          break;
  55          case DoCreate:
  56          case DoOpenOrCreate:
  57             if(created){
  58                construct<Arg>(address);
  59             }
  60             return true;
  61          break;
  62
  63          default:
  64             return false;
  65          break;
  66       }
  67    }
  68
  69    static std::size_t get_min_size()
  70    {  return sizeof(T);  }
  71
  72    private:
  73    create_enum_t m_creation_type;
  74    Arg m_arg;
  75 };
  76
  77 }  //namespace ipcdetail {
  78 }  //namespace interprocess {
  79 }  //namespace boost {
  80
  81 #endif   //BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP