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Also check structs with a single element of varying types when searching for a type with a particular alignment.

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[SVN r19908]
This commit is contained in:
Douglas Gregor
2003-09-02 22:41:10 +00:00
parent 42f271a4dc
commit 2ffc663dd5
1 changed files with 23 additions and 1 deletions
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24
include/boost/type_traits/type_with_alignment.hpp
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@@ -12,6 +12,8 @@
#include "boost/preprocessor/list/for_each_i.hpp"
#include "boost/preprocessor/tuple/to_list.hpp"
#include "boost/preprocessor/cat.hpp"
#include <boost/preprocessor/list/transform.hpp>
#include <boost/preprocessor/list/append.hpp>
#include "boost/type_traits/alignment_of.hpp"
#include "boost/type_traits/is_pod.hpp"
#include "boost/static_assert.hpp"
@@ -38,11 +40,22 @@ typedef void (*function_ptr)();
typedef int (alignment_dummy::*member_ptr);
typedef int (alignment_dummy::*member_function_ptr)();
#define BOOST_TT_ALIGNMENT_TYPES BOOST_PP_TUPLE_TO_LIST( \
#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))
#define BOOST_TT_HAS_ONE_T(D,Data,T) boost::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)
#define BOOST_TT_CHOOSE_MIN_ALIGNMENT(R,P,I,T) \
typename mpl::if_c< \
(alignment_of<T>::value == target && !BOOST_PP_CAT(found,I)), \
@@ -52,6 +65,12 @@ typedef int (alignment_dummy::*member_function_ptr)();
#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
{
@@ -73,6 +92,9 @@ union max_align
)
};
#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