77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// 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 <cstddef>
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namespace boost { namespace python { namespace detail {
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struct alignment_dummy;
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typedef void (*function_ptr)();
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typedef int (alignment_dummy::*member_ptr);
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typedef int (alignment_dummy::*member_function_ptr)();
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# define BOOST_PYTHON_ALIGNER(T, n) \
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typename mpl::if_c< \
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sizeof(T) <= size, T, char>::type t##n
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// Storage for size bytes, aligned to all fundamental types no larger than size
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template <std::size_t size>
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union aligned_storage
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{
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BOOST_PYTHON_ALIGNER(char, 0);
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BOOST_PYTHON_ALIGNER(short, 1);
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BOOST_PYTHON_ALIGNER(int, 2);
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BOOST_PYTHON_ALIGNER(long, 3);
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BOOST_PYTHON_ALIGNER(float, 4);
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BOOST_PYTHON_ALIGNER(double, 5);
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BOOST_PYTHON_ALIGNER(long double, 6);
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BOOST_PYTHON_ALIGNER(void*, 7);
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BOOST_PYTHON_ALIGNER(function_ptr, 8);
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BOOST_PYTHON_ALIGNER(member_ptr, 9);
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BOOST_PYTHON_ALIGNER(member_function_ptr, 10);
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char bytes[size];
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};
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# undef BOOST_PYTHON_ALIGNER
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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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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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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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# else
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template <class T> struct referent_size
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{
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static T f();
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BOOST_STATIC_CONSTANT(std::size_t, value = sizeof(f()));
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};
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# endif
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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 aligned_storage<
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::boost::python::detail::referent_size<T>::value
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> 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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