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// Copyright David Abrahams 2002.
// 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 REFERENT_STORAGE_DWA200278_HPP
# define REFERENT_STORAGE_DWA200278_HPP
# include <boost/mpl/if.hpp>
# include <cstddef>
namespace boost { namespace python { namespace detail {
struct alignment_dummy;
typedef void (*function_ptr)();
typedef int (alignment_dummy::*member_ptr);
typedef int (alignment_dummy::*member_function_ptr)();
# define BOOST_PYTHON_ALIGNER(T, n) \
typename mpl::if_c< \
sizeof(T) <= size, T, char>::type t##n
// Storage for size bytes, aligned to all fundamental types no larger than size
template <std::size_t size>
union aligned_storage
{
BOOST_PYTHON_ALIGNER(char, 0);
BOOST_PYTHON_ALIGNER(short, 1);
BOOST_PYTHON_ALIGNER(int, 2);
BOOST_PYTHON_ALIGNER(long, 3);
BOOST_PYTHON_ALIGNER(float, 4);
BOOST_PYTHON_ALIGNER(double, 5);
BOOST_PYTHON_ALIGNER(long double, 6);
BOOST_PYTHON_ALIGNER(void*, 7);
BOOST_PYTHON_ALIGNER(function_ptr, 8);
BOOST_PYTHON_ALIGNER(member_ptr, 9);
BOOST_PYTHON_ALIGNER(member_function_ptr, 10);
char bytes[size];
};
# undef BOOST_PYTHON_ALIGNER
// Compute the size of T's referent. We wouldn't need this at all,
// but sizeof() is broken in CodeWarriors <= 8.0
template <class T> struct referent_size;
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T>
struct referent_size<T&>
{
BOOST_STATIC_CONSTANT(
std::size_t, value = sizeof(T));
};
# else
template <class T> struct referent_size
{
static T f();
BOOST_STATIC_CONSTANT(std::size_t, value = sizeof(f()));
};
# endif
// A metafunction returning a POD type which can store U, where T ==
// U&. If T is not a reference type, returns a POD which can store T.
template <class T>
struct referent_storage
{
typedef aligned_storage<
::boost::python::detail::referent_size<T>::value
> type;
};
}}} // namespace boost::python::detail
#endif // REFERENT_STORAGE_DWA200278_HPP
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