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- // (C) Copyright John Maddock 2000.
- // Use, modification and distribution are subject to 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).
- //
- // See http://www.boost.org/libs/type_traits for most recent version including documentation.
- #ifndef BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
- #define BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
- #include <boost/type_traits/alignment_of.hpp>
- #include <boost/type_traits/is_pod.hpp>
- #include <boost/static_assert.hpp>
- #include <boost/config.hpp>
- #include <cstddef> // size_t
- #include <boost/detail/workaround.hpp>
- #ifdef BOOST_MSVC
- # pragma warning(push)
- # pragma warning(disable: 4121) // alignment is sensitive to packing
- #endif
- #ifdef _MSC_VER
- #include <boost/type_traits/conditional.hpp>
- #endif
- namespace boost {
- #ifndef __BORLANDC__
- namespace detail{
- union max_align
- {
- char c;
- short s;
- int i;
- long l;
- #ifndef BOOST_NO_LONG_LONG
- boost::long_long_type ll;
- #endif
- #ifdef BOOST_HAS_INT128
- boost::int128_type i128;
- #endif
- float f;
- double d;
- long double ld;
- #ifdef BOOST_HAS_FLOAT128
- __float128 f128;
- #endif
- };
- template <std::size_t Target, bool check> struct long_double_alignment{ typedef long double type; };
- template <std::size_t Target> struct long_double_alignment<Target, false>{ typedef boost::detail::max_align type; };
- template <std::size_t Target, bool check> struct double_alignment{ typedef double type; };
- template <std::size_t Target> struct double_alignment<Target, false>{ typedef typename long_double_alignment<Target, boost::alignment_of<long double>::value >= Target>::type type; };
- #ifndef BOOST_NO_LONG_LONG
- template <std::size_t Target, bool check> struct long_long_alignment{ typedef boost::long_long_type type; };
- template <std::size_t Target> struct long_long_alignment<Target, false>{ typedef typename double_alignment<Target, boost::alignment_of<double>::value >= Target>::type type; };
- #endif
- template <std::size_t Target, bool check> struct long_alignment{ typedef long type; };
- #ifndef BOOST_NO_LONG_LONG
- template <std::size_t Target> struct long_alignment<Target, false>{ typedef typename long_long_alignment<Target, boost::alignment_of<boost::long_long_type>::value >= Target>::type type; };
- #else
- template <std::size_t Target> struct long_alignment<Target, false>{ typedef typename double_alignment<Target, boost::alignment_of<double>::value >= Target>::type type; };
- #endif
- template <std::size_t Target, bool check> struct int_alignment{ typedef int type; };
- template <std::size_t Target> struct int_alignment<Target, false>{ typedef typename long_alignment<Target, boost::alignment_of<long>::value >= Target>::type type; };
- template <std::size_t Target, bool check> struct short_alignment{ typedef short type; };
- template <std::size_t Target> struct short_alignment<Target, false>{ typedef typename int_alignment<Target, boost::alignment_of<int>::value >= Target>::type type; };
- template <std::size_t Target, bool check> struct char_alignment{ typedef char type; };
- template <std::size_t Target> struct char_alignment<Target, false>{ typedef typename short_alignment<Target, boost::alignment_of<short>::value >= Target>::type type; };
- } // namespace detail
- template <std::size_t Align>
- struct type_with_alignment
- {
- typedef typename boost::detail::char_alignment<Align, boost::alignment_of<char>::value >= Align>::type type;
- };
- #if (defined(__GNUC__) || (defined (__SUNPRO_CC) && (__SUNPRO_CC >= 0x5130)) || defined(__clang__)) && !defined(BOOST_TT_DISABLE_INTRINSICS)
- namespace tt_align_ns {
- struct __attribute__((__aligned__(2))) a2 {};
- struct __attribute__((__aligned__(4))) a4 {};
- struct __attribute__((__aligned__(8))) a8 {};
- struct __attribute__((__aligned__(16))) a16 {};
- struct __attribute__((__aligned__(32))) a32 {};
- struct __attribute__((__aligned__(64))) a64 {};
- struct __attribute__((__aligned__(128))) a128 {};
- }
- template<> struct type_with_alignment<1> { public: typedef char type; };
- template<> struct type_with_alignment<2> { public: typedef tt_align_ns::a2 type; };
- template<> struct type_with_alignment<4> { public: typedef tt_align_ns::a4 type; };
- template<> struct type_with_alignment<8> { public: typedef tt_align_ns::a8 type; };
- template<> struct type_with_alignment<16> { public: typedef tt_align_ns::a16 type; };
- template<> struct type_with_alignment<32> { public: typedef tt_align_ns::a32 type; };
- template<> struct type_with_alignment<64> { public: typedef tt_align_ns::a64 type; };
- template<> struct type_with_alignment<128> { public: typedef tt_align_ns::a128 type; };
- template<> struct is_pod< ::boost::tt_align_ns::a2> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a4> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a8> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a16> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a32> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a64> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a128> : public true_type{};
- #endif
- #if (defined(BOOST_MSVC) || (defined(BOOST_INTEL) && defined(_MSC_VER))) && !defined(BOOST_TT_DISABLE_INTRINSICS)
- //
- // MSVC supports types which have alignments greater than the normal
- // maximum: these are used for example in the types __m64 and __m128
- // to provide types with alignment requirements which match the SSE
- // registers. Therefore we extend type_with_alignment<> to support
- // such types, however, we have to be careful to use a builtin type
- // whenever possible otherwise we break previously working code:
- // see http://article.gmane.org/gmane.comp.lib.boost.devel/173011
- // for an example and test case. Thus types like a8 below will
- // be used *only* if the existing implementation can't provide a type
- // with suitable alignment. This does mean however, that type_with_alignment<>
- // may return a type which cannot be passed through a function call
- // by value (and neither can any type containing such a type like
- // Boost.Optional). However, this only happens when we have no choice
- // in the matter because no other "ordinary" type is available.
- //
- namespace tt_align_ns {
- struct __declspec(align(8)) a8 {
- char m[8];
- typedef a8 type;
- };
- struct __declspec(align(16)) a16 {
- char m[16];
- typedef a16 type;
- };
- struct __declspec(align(32)) a32 {
- char m[32];
- typedef a32 type;
- };
- struct __declspec(align(64)) a64
- {
- char m[64];
- typedef a64 type;
- };
- struct __declspec(align(128)) a128 {
- char m[128];
- typedef a128 type;
- };
- }
- template<> struct type_with_alignment<8>
- {
- typedef boost::conditional<
- ::boost::alignment_of<boost::detail::max_align>::value < 8,
- tt_align_ns::a8,
- boost::detail::char_alignment<8, false> >::type t1;
- public:
- typedef t1::type type;
- };
- template<> struct type_with_alignment<16>
- {
- typedef boost::conditional<
- ::boost::alignment_of<boost::detail::max_align>::value < 16,
- tt_align_ns::a16,
- boost::detail::char_alignment<16, false> >::type t1;
- public:
- typedef t1::type type;
- };
- template<> struct type_with_alignment<32>
- {
- typedef boost::conditional<
- ::boost::alignment_of<boost::detail::max_align>::value < 32,
- tt_align_ns::a32,
- boost::detail::char_alignment<32, false> >::type t1;
- public:
- typedef t1::type type;
- };
- template<> struct type_with_alignment<64> {
- typedef boost::conditional<
- ::boost::alignment_of<boost::detail::max_align>::value < 64,
- tt_align_ns::a64,
- boost::detail::char_alignment<64, false> >::type t1;
- public:
- typedef t1::type type;
- };
- template<> struct type_with_alignment<128> {
- typedef boost::conditional<
- ::boost::alignment_of<boost::detail::max_align>::value < 128,
- tt_align_ns::a128,
- boost::detail::char_alignment<128, false> >::type t1;
- public:
- typedef t1::type type;
- };
- template<> struct is_pod< ::boost::tt_align_ns::a8> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a16> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a32> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a64> : public true_type{};
- template<> struct is_pod< ::boost::tt_align_ns::a128> : public true_type{};
- #endif
- #else
- //
- // Borland specific version, we have this for two reasons:
- // 1) The version above doesn't always compile (with the new test cases for example)
- // 2) Because of Borlands #pragma option we can create types with alignments that are
- // greater that the largest aligned builtin type.
- namespace tt_align_ns{
- #pragma option push -a16
- struct a2{ short s; };
- struct a4{ int s; };
- struct a8{ double s; };
- struct a16{ long double s; };
- #pragma option pop
- }
- namespace detail {
- typedef ::boost::tt_align_ns::a16 max_align;
- }
- //#if ! BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
- template <> struct is_pod< ::boost::tt_align_ns::a2> : public true_type{};
- template <> struct is_pod< ::boost::tt_align_ns::a4> : public true_type{};
- template <> struct is_pod< ::boost::tt_align_ns::a8> : public true_type{};
- template <> struct is_pod< ::boost::tt_align_ns::a16> : public true_type{};
- //#endif
- template <std::size_t N> struct type_with_alignment
- {
- // We should never get to here, but if we do use the maximally
- // aligned type:
- // BOOST_STATIC_ASSERT(0);
- typedef tt_align_ns::a16 type;
- };
- template <> struct type_with_alignment<1>{ typedef char type; };
- template <> struct type_with_alignment<2>{ typedef tt_align_ns::a2 type; };
- template <> struct type_with_alignment<4>{ typedef tt_align_ns::a4 type; };
- template <> struct type_with_alignment<8>{ typedef tt_align_ns::a8 type; };
- template <> struct type_with_alignment<16>{ typedef tt_align_ns::a16 type; };
- #endif
- } // namespace boost
- #ifdef BOOST_MSVC
- # pragma warning(pop)
- #endif
- #endif // BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
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