46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
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// Copyright David Abrahams 2002.
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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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#ifndef REFERENT_STORAGE_DWA200278_HPP
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# define REFERENT_STORAGE_DWA200278_HPP
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# include <boost/mpl/if.hpp>
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# include <boost/type_traits/aligned_storage.hpp>
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# include <cstddef>
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namespace boost { namespace python { namespace detail {
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template <std::size_t size, std::size_t alignment = std::size_t(-1)>
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struct aligned_storage
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{
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union type
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{
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typename ::boost::aligned_storage<size, alignment>::type data;
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char bytes[size];
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};
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};
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// Compute the size of T's referent. We wouldn't need this at all,
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// but sizeof() is broken in CodeWarriors <= 8.0
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template <class T> struct referent_size;
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template <class T>
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struct referent_size<T&>
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{
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BOOST_STATIC_CONSTANT(
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std::size_t, value = sizeof(T));
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};
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// A metafunction returning a POD type which can store U, where T ==
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// U&. If T is not a reference type, returns a POD which can store T.
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template <class T>
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struct referent_storage
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{
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typedef typename aligned_storage<referent_size<T>::value, alignment_of<T>::value>::type type;
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};
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}}} // namespace boost::python::detail
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#endif // REFERENT_STORAGE_DWA200278_HPP
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