Hi,
Is there any particular reason that type_with_alignment does not support
alignment more than 32 on gcc?
I am trying to create an unordered_map of objects that are aligned to
cache line size (64bytes) and it fails in type_with_alignment. This
small example shows it:
#include
struct __attribute__((aligned(64)) A { int i; };
int main()
{
std::tr1::unordered_map umap;
umap[0] = A();
return 0;
}
In file included from
/usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:21:0,
from
/usr/local/boost/boost_1.48/include/boost/type_traits/aligned_storage.hpp:11,
from
/usr/local/boost/boost_1.48/include/boost/unordered/detail/buckets.hpp:17,
from
/usr/local/boost/boost_1.48/include/boost/unordered/detail/table.hpp:10,
from
/usr/local/boost/boost_1.48/include/boost/unordered/detail/equivalent.hpp:14,
from
/usr/local/boost/boost_1.48/include/boost/unordered/unordered_map.hpp:18,
from
/usr/local/boost/boost_1.48/include/boost/unordered_map.hpp:16,
from
/usr/local/boost/boost_1.48/include/boost/tr1/unordered_map.hpp:21,
from test.cc:1:
/usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:
In instantiation of ‘boost::detail::type_with_alignment_imp<64ul>’:
/usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:216:7:
instantiated from ‘boost::type_with_alignment<64ul>’
/usr/local/boost/boost_1.48/include/boost/mpl/eval_if.hpp:60:31:
instantiated from ‘boost::mpl::eval_if_cboost::detail::max_align,
boost::type_with_alignment<64ul> >’
/usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:55:21:
instantiated from
‘boost::detail::aligned_storage::aligned_storage_imp<128ul, 64ul>::data_t’
/usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:56:7:
instantiated from
‘boost::detail::aligned_storage::aligned_storage_imp<128ul, 64ul>’
/usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:73:7:
instantiated from ‘boost::aligned_storage<128ul, 64ul>’
/usr/local/boost/boost_1.48/include/boost/unordered/detail/table.hpp:281:59:
instantiated from
‘boost::unordered::detail::value_base >’
/usr/local/boost/boost_1.48/include/boost/unordered/detail/unique.hpp:47:12:
instantiated from ‘boost::unordered::detail::ptr_node >’
/usr/local/boost/boost_1.48/include/boost/unordered/detail/unique.hpp:332:40:
instantiated from
‘boost::unordered::detail::table_impl<Types>::value_type&
boost::unordered::detail::table_impl<Types>::operator[](const key_type&)
[with Types =
boost::unordered::detail::map >,
int, boost::hash<int>, std::equal_to<int> >,
boost::unordered::detail::table_impl<Types>::value_type =
std::pair,
boost::unordered::detail::table_impl<Types>::key_type = int]’
/usr/local/boost/boost_1.48/include/boost/unordered/unordered_map.hpp:1007:26:
instantiated from ‘boost::unordered::unordered_map::mapped_type& boost::unordered::unordered_map::operator[](const key_type&) [with K = int, T = A, H =
boost::hash<int>, P = std::equal_to<int>, A =
std::allocator >,
boost::unordered::unordered_map::mapped_type = A,
boost::unordered::unordered_map::key_type = int]’
test.cc:11:9: instantiated from here
/usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:206:1:
error: invalid application of ‘sizeof’ to incomplete type
‘boost::STATIC_ASSERTION_FAILURE<false>’
/usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:207:1:
error: invalid application of ‘sizeof’ to incomplete type
‘boost::STATIC_ASSERTION_FAILURE<false>’
Is there any easy way to avoid this problem?
Thanks
