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- //-----------------------------------------------------------------------------
- // boost aligned_storage.hpp header file
- // See http://www.boost.org for updates, documentation, and revision history.
- //-----------------------------------------------------------------------------
- //
- // Copyright (c) 2002-2003
- // Eric Friedman, Itay Maman
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_TT_ALIGNED_STORAGE_HPP
- #define BOOST_TT_ALIGNED_STORAGE_HPP
- #include <cstddef> // for std::size_t
- #include <boost/config.hpp>
- #include <boost/detail/workaround.hpp>
- #include <boost/type_traits/alignment_of.hpp>
- #include <boost/type_traits/type_with_alignment.hpp>
- #include <boost/type_traits/is_pod.hpp>
- #include <boost/type_traits/conditional.hpp>
- namespace boost {
- namespace detail { namespace aligned_storage {
- BOOST_STATIC_CONSTANT(
- std::size_t
- , alignment_of_max_align = ::boost::alignment_of<boost::detail::max_align>::value
- );
- //
- // To be TR1 conforming this must be a POD type:
- //
- template <
- std::size_t size_
- , std::size_t alignment_
- >
- struct aligned_storage_imp
- {
- union data_t
- {
- char buf[size_];
- typename ::boost::type_with_alignment<alignment_>::type align_;
- } data_;
- void* address() const { return const_cast<aligned_storage_imp*>(this); }
- };
- template <std::size_t size>
- struct aligned_storage_imp<size, std::size_t(-1)>
- {
- union data_t
- {
- char buf[size];
- ::boost::detail::max_align align_;
- } data_;
- void* address() const { return const_cast<aligned_storage_imp*>(this); }
- };
- template< std::size_t alignment_ >
- struct aligned_storage_imp<0u,alignment_>
- {
- /* intentionally empty */
- void* address() const { return 0; }
- };
- }} // namespace detail::aligned_storage
- template <
- std::size_t size_
- , std::size_t alignment_ = std::size_t(-1)
- >
- class aligned_storage :
- #ifndef __BORLANDC__
- private
- #else
- public
- #endif
- ::boost::detail::aligned_storage::aligned_storage_imp<size_, alignment_>
- {
-
- public: // constants
- typedef ::boost::detail::aligned_storage::aligned_storage_imp<size_, alignment_> type;
- BOOST_STATIC_CONSTANT(
- std::size_t
- , size = size_
- );
- BOOST_STATIC_CONSTANT(
- std::size_t
- , alignment = (
- alignment_ == std::size_t(-1)
- ? ::boost::detail::aligned_storage::alignment_of_max_align
- : alignment_
- )
- );
- private: // noncopyable
- aligned_storage(const aligned_storage&);
- aligned_storage& operator=(const aligned_storage&);
- public: // structors
- aligned_storage()
- {
- }
- ~aligned_storage()
- {
- }
- public: // accessors
- void* address()
- {
- return static_cast<type*>(this)->address();
- }
- const void* address() const
- {
- return static_cast<const type*>(this)->address();
- }
- };
- //
- // Make sure that is_pod recognises aligned_storage<>::type
- // as a POD (Note that aligned_storage<> itself is not a POD):
- //
- template <std::size_t size_, std::size_t alignment_>
- struct is_pod< ::boost::detail::aligned_storage::aligned_storage_imp<size_, alignment_> > : public true_type{};
- } // namespace boost
- #endif // BOOST_ALIGNED_STORAGE_HPP
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