| // (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 <ndnboost/mpl/if.hpp> |
| #include <ndnboost/preprocessor/list/for_each_i.hpp> |
| #include <ndnboost/preprocessor/tuple/to_list.hpp> |
| #include <ndnboost/preprocessor/cat.hpp> |
| #include <ndnboost/preprocessor/list/transform.hpp> |
| #include <ndnboost/preprocessor/list/append.hpp> |
| #include <ndnboost/type_traits/alignment_of.hpp> |
| #include <ndnboost/type_traits/is_pod.hpp> |
| #include <ndnboost/static_assert.hpp> |
| #include <ndnboost/config.hpp> |
| |
| // should be the last #include |
| #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
| |
| #include <cstddef> |
| |
| #ifdef BOOST_MSVC |
| # pragma warning(push) |
| # pragma warning(disable: 4121) // alignment is sensitive to packing |
| #endif |
| |
| namespace ndnboost { |
| |
| #ifndef __BORLANDC__ |
| |
| namespace detail { |
| |
| class alignment_dummy; |
| typedef void (*function_ptr)(); |
| typedef int (alignment_dummy::*member_ptr); |
| typedef int (alignment_dummy::*member_function_ptr)(); |
| |
| #ifdef BOOST_HAS_LONG_LONG |
| #define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \ |
| 12, ( \ |
| char, short, int, long, ::ndnboost::long_long_type, float, double, long double \ |
| , void*, function_ptr, member_ptr, member_function_ptr)) |
| #else |
| #define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \ |
| 11, ( \ |
| char, short, int, long, float, double, long double \ |
| , void*, function_ptr, member_ptr, member_function_ptr)) |
| #endif |
| |
| #define BOOST_TT_HAS_ONE_T(D,Data,T) ndnboost::detail::has_one_T< T > |
| |
| #define BOOST_TT_ALIGNMENT_STRUCT_TYPES \ |
| BOOST_PP_LIST_TRANSFORM(BOOST_TT_HAS_ONE_T, \ |
| X, \ |
| BOOST_TT_ALIGNMENT_BASE_TYPES) |
| |
| #define BOOST_TT_ALIGNMENT_TYPES \ |
| BOOST_PP_LIST_APPEND(BOOST_TT_ALIGNMENT_BASE_TYPES, \ |
| BOOST_TT_ALIGNMENT_STRUCT_TYPES) |
| |
| // |
| // lower_alignment_helper -- |
| // |
| // This template gets instantiated a lot, so use partial |
| // specialization when available to reduce the compiler burden. |
| // |
| #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| template <bool found = true> |
| struct lower_alignment_helper_impl |
| { |
| template <std::size_t, class> |
| struct apply |
| { |
| typedef char type; |
| enum { value = true }; |
| }; |
| }; |
| |
| template <> |
| struct lower_alignment_helper_impl<false> |
| { |
| template <std::size_t target, class TestType> |
| struct apply |
| : public mpl::if_c<(alignment_of<TestType>::value == target), TestType, char> |
| { |
| enum { value = (alignment_of<TestType>::value == target) }; |
| }; |
| }; |
| |
| template <bool found, std::size_t target, class TestType> |
| struct lower_alignment_helper |
| : public lower_alignment_helper_impl<found>::template apply<target,TestType> |
| { |
| }; |
| #else |
| template <bool found, std::size_t target, class TestType> |
| struct lower_alignment_helper |
| { |
| typedef char type; |
| enum { value = true }; |
| }; |
| |
| template <std::size_t target, class TestType> |
| struct lower_alignment_helper<false,target,TestType> |
| { |
| enum { value = (alignment_of<TestType>::value == target) }; |
| typedef typename mpl::if_c<value, TestType, char>::type type; |
| }; |
| #endif |
| |
| #define BOOST_TT_CHOOSE_MIN_ALIGNMENT(R,P,I,T) \ |
| typename lower_alignment_helper< \ |
| BOOST_PP_CAT(found,I),target,T \ |
| >::type BOOST_PP_CAT(t,I); \ |
| enum { \ |
| BOOST_PP_CAT(found,BOOST_PP_INC(I)) \ |
| = lower_alignment_helper<BOOST_PP_CAT(found,I),target,T >::value \ |
| }; |
| |
| #define BOOST_TT_CHOOSE_T(R,P,I,T) T BOOST_PP_CAT(t,I); |
| |
| template <typename T> |
| struct has_one_T |
| { |
| T data; |
| }; |
| |
| template <std::size_t target> |
| union lower_alignment |
| { |
| enum { found0 = false }; |
| |
| BOOST_PP_LIST_FOR_EACH_I( |
| BOOST_TT_CHOOSE_MIN_ALIGNMENT |
| , ignored |
| , BOOST_TT_ALIGNMENT_TYPES |
| ) |
| }; |
| |
| union max_align |
| { |
| BOOST_PP_LIST_FOR_EACH_I( |
| BOOST_TT_CHOOSE_T |
| , ignored |
| , BOOST_TT_ALIGNMENT_TYPES |
| ) |
| }; |
| |
| #undef BOOST_TT_ALIGNMENT_BASE_TYPES |
| #undef BOOST_TT_HAS_ONE_T |
| #undef BOOST_TT_ALIGNMENT_STRUCT_TYPES |
| #undef BOOST_TT_ALIGNMENT_TYPES |
| #undef BOOST_TT_CHOOSE_MIN_ALIGNMENT |
| #undef BOOST_TT_CHOOSE_T |
| |
| template<std::size_t TAlign, std::size_t Align> |
| struct is_aligned |
| { |
| BOOST_STATIC_CONSTANT(bool, |
| value = (TAlign >= Align) & (TAlign % Align == 0) |
| ); |
| }; |
| |
| #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::max_align,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<1> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<2> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<4> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<8> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<10> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<16> ,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::detail::lower_alignment<32> ,true) |
| #endif |
| |
| } // namespace detail |
| |
| #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| template<std::size_t Align> |
| struct is_pod< ::ndnboost::detail::lower_alignment<Align> > |
| { |
| BOOST_STATIC_CONSTANT(std::size_t, value = true); |
| }; |
| #endif |
| |
| // This alignment method originally due to Brian Parker, implemented by David |
| // Abrahams, and then ported here by Doug Gregor. |
| namespace detail{ |
| |
| template <std::size_t Align> |
| class type_with_alignment_imp |
| { |
| typedef ::ndnboost::detail::lower_alignment<Align> t1; |
| typedef typename mpl::if_c< |
| ::ndnboost::detail::is_aligned< ::ndnboost::alignment_of<t1>::value,Align >::value |
| , t1 |
| , ::ndnboost::detail::max_align |
| >::type align_t; |
| |
| BOOST_STATIC_CONSTANT(std::size_t, found = alignment_of<align_t>::value); |
| |
| BOOST_STATIC_ASSERT(found >= Align); |
| BOOST_STATIC_ASSERT(found % Align == 0); |
| |
| public: |
| typedef align_t type; |
| }; |
| |
| } |
| |
| template <std::size_t Align> |
| class type_with_alignment |
| : public ::ndnboost::detail::type_with_alignment_imp<Align> |
| { |
| }; |
| |
| #if defined(__GNUC__) |
| namespace align { |
| 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<> class type_with_alignment<1> { public: typedef char type; }; |
| template<> class type_with_alignment<2> { public: typedef align::a2 type; }; |
| template<> class type_with_alignment<4> { public: typedef align::a4 type; }; |
| template<> class type_with_alignment<8> { public: typedef align::a8 type; }; |
| template<> class type_with_alignment<16> { public: typedef align::a16 type; }; |
| template<> class type_with_alignment<32> { public: typedef align::a32 type; }; |
| template<> class type_with_alignment<64> { public: typedef align::a64 type; }; |
| template<> class type_with_alignment<128> { public: typedef align::a128 type; }; |
| |
| namespace detail { |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a2,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a4,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a8,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a16,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a32,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a64,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a128,true) |
| } |
| #endif |
| #if (defined(BOOST_MSVC) || (defined(BOOST_INTEL) && defined(_MSC_VER))) && _MSC_VER >= 1300 |
| // |
| // 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 align { |
| 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<> class type_with_alignment<8> |
| { |
| typedef mpl::if_c< |
| ::ndnboost::alignment_of<ndnboost::detail::max_align>::value < 8, |
| align::a8, |
| ndnboost::detail::type_with_alignment_imp<8> >::type t1; |
| public: |
| typedef t1::type type; |
| }; |
| template<> class type_with_alignment<16> |
| { |
| typedef mpl::if_c< |
| ::ndnboost::alignment_of<ndnboost::detail::max_align>::value < 16, |
| align::a16, |
| ndnboost::detail::type_with_alignment_imp<16> >::type t1; |
| public: |
| typedef t1::type type; |
| }; |
| template<> class type_with_alignment<32> |
| { |
| typedef mpl::if_c< |
| ::ndnboost::alignment_of<ndnboost::detail::max_align>::value < 32, |
| align::a32, |
| ndnboost::detail::type_with_alignment_imp<32> >::type t1; |
| public: |
| typedef t1::type type; |
| }; |
| template<> class type_with_alignment<64> { |
| typedef mpl::if_c< |
| ::ndnboost::alignment_of<ndnboost::detail::max_align>::value < 64, |
| align::a64, |
| ndnboost::detail::type_with_alignment_imp<64> >::type t1; |
| public: |
| typedef t1::type type; |
| }; |
| template<> class type_with_alignment<128> { |
| typedef mpl::if_c< |
| ::ndnboost::alignment_of<ndnboost::detail::max_align>::value < 128, |
| align::a128, |
| ndnboost::detail::type_with_alignment_imp<128> >::type t1; |
| public: |
| typedef t1::type type; |
| }; |
| |
| namespace detail { |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a8,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a16,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a32,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a64,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a128,true) |
| } |
| #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 align{ |
| #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 ::ndnboost::align::a16 max_align; |
| |
| //#if ! BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610)) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a2,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a4,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a8,true) |
| BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::ndnboost::align::a16,true) |
| //#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 align::a16 type; |
| }; |
| template <> struct type_with_alignment<1>{ typedef char type; }; |
| template <> struct type_with_alignment<2>{ typedef align::a2 type; }; |
| template <> struct type_with_alignment<4>{ typedef align::a4 type; }; |
| template <> struct type_with_alignment<8>{ typedef align::a8 type; }; |
| template <> struct type_with_alignment<16>{ typedef align::a16 type; }; |
| |
| #endif |
| |
| } // namespace ndnboost |
| |
| #ifdef BOOST_MSVC |
| # pragma warning(pop) |
| #endif |
| |
| #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
| |
| #endif // BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED |
| |
| |