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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_ALIGNED_STORAGE_HPP
#define BOOST_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/mpl/eval_if.hpp"
#include "boost/mpl/identity.hpp"
#include "boost/type_traits/detail/bool_trait_def.hpp"
namespace boost {
namespace detail { namespace aligned_storage {
BOOST_STATIC_CONSTANT(
std::size_t
, alignment_of_max_align = ::boost::alignment_of<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 mpl::eval_if_c<
alignment_ == std::size_t(-1)
, mpl::identity<detail::max_align>
, type_with_alignment<alignment_>
>::type 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
detail::aligned_storage::aligned_storage_imp<size_, alignment_>
{
public: // constants
typedef 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_
)
);
#if defined(__GNUC__) &&\
(__GNUC__ > 3) ||\
(__GNUC__ == 3 && (__GNUC_MINOR__ > 2 ||\
(__GNUC_MINOR__ == 2 && __GNUC_PATCHLEVEL__ >=3)))
private: // noncopyable
aligned_storage(const aligned_storage&);
aligned_storage& operator=(const aligned_storage&);
#else // gcc less than 3.2.3
public: // _should_ be noncopyable, but GCC compiler emits error
aligned_storage(const aligned_storage&);
aligned_storage& operator=(const aligned_storage&);
#endif // gcc < 3.2.3 workaround
public: // structors
aligned_storage()
{
}
~aligned_storage()
{
}
public: // accessors
void* address()
{
return static_cast<type*>(this)->address();
}
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
const void* address() const
{
return static_cast<const type*>(this)->address();
}
#else // MSVC6
const void* address() const;
#endif // MSVC6 workaround
};
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
// MSVC6 seems not to like inline functions with const void* returns, so we
// declare the following here:
template <std::size_t S, std::size_t A>
const void* aligned_storage<S,A>::address() const
{
return const_cast< aligned_storage<S,A>* >(this)->address();
}
#endif // MSVC6 workaround
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
//
// 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_> >
BOOST_TT_AUX_BOOL_C_BASE(true)
{
BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(true)
};
#endif
} // namespace boost
#include "boost/type_traits/detail/bool_trait_undef.hpp"
#endif // BOOST_ALIGNED_STORAGE_HPP
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