[boost] [typetraits] type_with_alignment

From: Andreas Brinck (andreas.brinck_at_[hidden])
Date: 2007-10-11 01:44:50

(Sorry for sending this twice, I didn't format the subject the correct way
first time)

Hi,

I'm using Visual Studio 2005 and got into trouble when I tried to serialize
a class with 16 byte alignment:

__declspec(align(16)) class Vech
{
    ...
    __m128 m_data;
};

The problem is that the following static assert in type_with_alignment is
triggered:

BOOST_STATIC_ASSERT(found % Align == 0);

which in turn stems from the fact that sizeof(max_align) == 8. By changing
the lines:

#define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \
        12, ( \
        char, short, int, long,  ::boost::long_long_type, float, double,
long double \
        , void*, function_ptr, member_ptr, member_function_ptr))

to

#include <xmmintrin.h>

#define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \
        13, ( \
        char, short, int, long,  ::boost::long_long_type, float, double,
long double \
        , void*, function_ptr, member_ptr, member_function_ptr, __m128))

I got rid of the static assert and everything seems to work just fine. Would
it be possible to get this "fix" into a later release of boost in a more
rigorous and organized fashion (with all the surrounding compiler
workarounds and typedefs etc.)?

Or is there another way to get the same effect?

Regards

/A.B.