68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
// Boost.TypeErasure library
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//
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// Copyright 2011 Steven Watanabe
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//
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// Distributed under the Boost Software License Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// $Id: storage.hpp 83253 2013-03-02 21:48:27Z steven_watanabe $
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#ifndef BOOST_TYPE_ERASURE_DETAIL_STORAGE_HPP_INCLUDED
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#define BOOST_TYPE_ERASURE_DETAIL_STORAGE_HPP_INCLUDED
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#include <boost/type_traits/remove_reference.hpp>
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namespace boost {
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namespace type_erasure {
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namespace detail {
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struct storage
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{
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storage() {}
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template<class T>
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storage(const T& arg) : data(new T(arg)) {}
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void* data;
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<class T>
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T extract(T arg) { return std::forward<T>(arg); }
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#else
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template<class T>
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T extract(T arg) { return arg; }
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#endif
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template<class T>
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T extract(storage& arg)
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{
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return *static_cast<typename ::boost::remove_reference<T>::type*>(arg.data);
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}
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template<class T>
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T extract(const storage& arg)
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{
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return *static_cast<const typename ::boost::remove_reference<T>::type*>(arg.data);
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}
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<class T>
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T extract(storage&& arg)
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{
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return std::move(*static_cast<typename ::boost::remove_reference<T>::type*>(arg.data));
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}
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#endif
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}
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}
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}
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#endif
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