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Partially reverting e1b82afbbe hoping to appease VC++

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This commit is contained in:
rbock 2017-12-19 09:06:56 +01:00
parent f6903e09ed
commit e49428c58c
1 changed files with 23 additions and 21 deletions
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44
include/sqlpp11/type_traits.h
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@ -124,7 +124,7 @@ namespace sqlpp
template <typename T>
struct column_spec_can_be_null_impl<
T,
typename std::enable_if<T::_traits::_tags::template count<tag::can_be_null>()>::type>
typename std::enable_if<detail::is_element_of<tag::can_be_null, typename T::_traits::_tags>::value>::type>
{
using type = std::true_type;
};
@ -132,25 +132,27 @@ namespace sqlpp
template <typename T>
using column_spec_can_be_null_t = typename detail::column_spec_can_be_null_impl<T>::type;
#define SQLPP_VALUE_TRAIT_GENERATOR(name) \
namespace tag \
{ \
struct name; \
} \
namespace detail \
{ \
template <typename T, typename Enable = void> \
struct name##_impl \
{ \
using type = std::false_type; \
}; \
template <typename T> \
struct name##_impl<T, typename std::enable_if<T::_traits::_tags::template count<tag::name>()>::type> \
{ \
using type = std::true_type; \
}; \
} \
template <typename T> \
#define SQLPP_VALUE_TRAIT_GENERATOR(name) \
namespace tag \
{ \
struct name; \
} \
namespace detail \
{ \
template <typename T, typename Enable = void> \
struct name##_impl \
{ \
using type = std::false_type; \
}; \
template <typename T> \
struct name##_impl< \
T, \
typename std::enable_if<detail::is_element_of<tag::name, typename T::_traits::_tags>::value>::type> \
{ \
using type = std::true_type; \
}; \
} \
template <typename T> \
using name##_t = typename detail::name##_impl<T>::type;
SQLPP_VALUE_TRAIT_GENERATOR(is_sql_null)
@ -324,7 +326,7 @@ namespace sqlpp
template <typename KnownAggregates, typename T>
struct is_aggregate_expression_impl<KnownAggregates,
T,
typename std::enable_if<KnownAggregates::template count<T>()>::type>
typename std::enable_if<detail::is_element_of<T, KnownAggregates>::value>::type>
{
using type = std::true_type;
};