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Extract BOOST_INTRUSIVE_HAS_TYPE trait

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Ion Gaztañaga
2017-09-07 20:17:05 +02:00
parent b6f688321c
commit 7f5caca12e
1 changed files with 15 additions and 5 deletions
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20
include/boost/intrusive/detail/mpl.hpp
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@@ -86,8 +86,8 @@ struct ls_zeros<1>
// Infrastructure for providing a default type for T::TNAME if absent.
#define BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(TNAME) \
template <typename T, typename DefaultType> \
struct boost_intrusive_default_type_ ## TNAME \
template <typename T> \
struct boost_intrusive_has_type_ ## TNAME \
{ \
template <typename X> \
static char test(int, typename X::TNAME*); \
@@ -95,13 +95,18 @@ struct ls_zeros<1>
template <typename X> \
static int test(...); \
\
struct DefaultWrap { typedef DefaultType TNAME; }; \
\
static const bool value = (1 == sizeof(test<T>(0, 0))); \
}; \
\
template <typename T, typename DefaultType> \
struct boost_intrusive_default_type_ ## TNAME \
{ \
struct DefaultWrap { typedef DefaultType TNAME; }; \
\
typedef typename \
::boost::intrusive::detail::if_c \
<value, T, DefaultWrap>::type::TNAME type; \
< boost_intrusive_has_type_ ## TNAME<T>::value \
, T, DefaultWrap>::type::TNAME type; \
}; \
//
@@ -110,6 +115,11 @@ struct ls_zeros<1>
boost_intrusive_default_type_ ## TNAME< T, TIMPL >::type \
//
#define BOOST_INTRUSIVE_HAS_TYPE(INSTANTIATION_NS_PREFIX, T, TNAME) \
INSTANTIATION_NS_PREFIX \
boost_intrusive_has_type_ ## TNAME< T >::value \
//
#define BOOST_INTRUSIVE_INSTANTIATE_EVAL_DEFAULT_TYPE_TMPLT(TNAME)\
template <typename T, typename DefaultType> \
struct boost_intrusive_eval_default_type_ ## TNAME \