164 lines
3.9 KiB
C++
Executable File
164 lines
3.9 KiB
C++
Executable File
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_MOVE_HPP
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#define BOOST_INTERPROCESS_MOVE_HPP
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#if (defined _MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/interprocess_fwd.hpp>
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#include <boost/interprocess/detail/mpl.hpp>
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//!\file
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//!Describes a function and a type to emulate move semantics.
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namespace boost {
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namespace interprocess {
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//!Trait class to detect if a type is
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//!movable
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template <class T>
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struct is_movable
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{
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enum { value = false };
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};
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} //namespace interprocess {
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} //namespace boost {
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#ifndef BOOST_INTERPROCESS_RVALUE_REFERENCE
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#include <boost/interprocess/detail/mpl.hpp>
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#include <boost/interprocess/detail/type_traits.hpp>
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namespace boost {
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namespace interprocess {
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namespace detail {
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//!An object that represents a
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//!moved object.
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template<class T>
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struct moved_object
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{
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moved_object(const T &obj)
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: m_obj(const_cast<T *>(&obj))
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{}
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T &get() const
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{ return *m_obj; }
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private:
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T *m_obj;
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};
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// Metafunction that, given movable T, provides move_source<T>, else T&.
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template <typename T>
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struct move_type
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{
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public: // metafunction result
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typedef typename if_<is_movable<T>, moved_object<T>, T&>::type type;
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};
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template <typename T>
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class move_return
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{
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typedef moved_object<T> moved_type;
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private:
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mutable T m_moved;
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public:
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typedef T type;
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move_return(const T& returned)
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: m_moved(moved_object<T>(returned))
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{}
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move_return(const move_return& operand)
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: m_moved(const_cast<move_return&>(operand))
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{}
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operator moved_type() const
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{ return moved_type(m_moved); }
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};
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template <typename T>
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struct return_type
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{
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public: // metafunction result
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typedef typename if_<is_movable<T>, move_return<T>, T>::type type;
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};
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} //namespace detail {
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} //namespace interprocess {
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} //namespace boost {
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namespace boost {
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namespace interprocess {
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namespace detail{
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//!A function that converts an object to a moved object so that
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//!it can match a function taking a detail::moved_object object.
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template<class Object>
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typename detail::move_type<Object>::type move_impl(const Object &object)
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{
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typedef typename detail::move_type<Object>::type type;
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return type(object);
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}
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} //namespace detail {
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//!A function that converts an object to a moved object so that
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//!it can match a function taking a detail::moved_object object.
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template<class Object>
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typename detail::move_type<Object>::type move(const Object &object)
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{ return detail::move_impl(object); }
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} //namespace interprocess {
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} //namespace boost {
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#else //#ifdef BOOST_INTERPROCESS_RVALUE_REFERENCE
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#include <boost/interprocess/detail/type_traits.hpp>
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namespace boost {
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namespace interprocess {
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namespace detail {
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template <class T>
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inline typename detail::remove_reference<T>::type&& move_impl(T&& t)
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{ return t; }
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template <class T>
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inline T&& forward_impl(typename detail::identity<T>::type&& t)
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{ return t; }
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} //namespace detail {
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template <class T>
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inline typename detail::remove_reference<T>::type&& move(T&& t)
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{ return t; }
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} //namespace interprocess {
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} //namespace boost {
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#endif //#ifdef BOOST_INTERPROCESS_RVALUE_REFERENCE
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //#ifndef BOOST_INTERPROCESS_MOVE_HPP
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