sync/shm/named_creation_functor.hpp

0001 //////////////////////////////////////////////////////////////////////////////
0002 //
0003 // (C) Copyright Ion Gaztanaga 2007-2012. Distributed under the Boost
0004 // Software License, Version 1.0. (See accompanying file
0005 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // See http://www.boost.org/libs/interprocess for documentation.
0008 //
0009 //////////////////////////////////////////////////////////////////////////////
0010
0011 #ifndef BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP
0012 #define BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP
0013
0014 #ifndef BOOST_CONFIG_HPP
0015 #  include <boost/config.hpp>
0016 #endif
0017 0018 ">#
0019 #if defined(BOOST_HAS_PRAGMA_ONCE)
0020 #  pragma once
0021 #endif
0022
0023 #include <boost/interprocess/creation_tags.hpp>
0024 #include <boost/interprocess/detail/type_traits.hpp>
0025 #include <boost/interprocess/detail/mpl.hpp>
0026 #include <boost/container/detail/placement_new.hpp>
0027
0028 namespace boost {
0029 namespace interprocess {
0030 namespace ipcdetail {
0031
0032 struct named_creation_functor_no_arg{};
0033
0034 template <class T, class Arg = named_creation_functor_no_arg>
0035 class named_creation_functor
0036 {
0037    typedef named_creation_functor_no_arg no_arg_t;
0038    public:
0039    named_creation_functor(create_enum_t type, Arg arg = Arg())
0040       :  m_creation_type(type), m_arg(arg){}
0041
0042    template<class ArgType>
0043    void construct(void *address, typename enable_if_c<is_same<ArgType, no_arg_t>::value>::type * = 0) const
0044    {  ::new(address, boost_container_new_t())T; }
0045
0046    template<class ArgType>
0047    void construct(void *address, typename enable_if_c<!is_same<ArgType, no_arg_t>::value>::type * = 0) const
0048    {  ::new(address, boost_container_new_t())T(m_arg); }
0049
0050    bool operator()(void *address, std::size_t, bool created) const
0051    {
0052       switch(m_creation_type){
0053          case DoOpen:
0054             return true;
0055          break;
0056          case DoCreate:
0057          case DoOpenOrCreate:
0058             if(created){
0059                construct<Arg>(address);
0060             }
0061             return true;
0062          break;
0063
0064          default:
0065             return false;
0066          break;
0067       }
0068    }
0069
0070    static std::size_t get_min_size()
0071    {  return sizeof(T);  }
0072
0073    private:
0074    create_enum_t m_creation_type;
0075    Arg m_arg;
0076 };
0077
0078 }  //namespace ipcdetail {
0079 }  //namespace interprocess {
0080 }  //namespace boost {
0081
0082 #endif   //BOOST_INTERPROCESS_SYNC_NAMED_CREATION_FUNCTOR_HPP