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Add friendship support to execution::occupancy property.

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This commit is contained in:
Christopher Kohlhoff 2021-01-06 23:20:50 +11:00
parent 3c55c553d1
commit 171328a6cb
1 changed files with 39 additions and 9 deletions
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48
asio/include/asio/execution/occupancy.hpp
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@ -89,16 +89,46 @@ struct occupancy_t
{
}
template <typename T>
struct static_proxy
{
#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
struct type
{
template <typename P>
static constexpr auto query(ASIO_MOVE_ARG(P) p)
noexcept(
noexcept(
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
)
)
-> decltype(
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
)
{
return T::query(ASIO_MOVE_CAST(P)(p));
}
};
#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
typedef T type;
#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
};
template <typename T>
struct query_static_constexpr_member :
traits::query_static_constexpr_member<
typename static_proxy<T>::type, occupancy_t> {};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
static ASIO_CONSTEXPR
typename traits::query_static_constexpr_member<T, occupancy_t>::result_type
typename query_static_constexpr_member<T>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, occupancy_t>::is_noexcept))
query_static_constexpr_member<T>::is_noexcept))
{
return traits::query_static_constexpr_member<T, occupancy_t>::value();
return query_static_constexpr_member<T>::value();
}
template <typename E, typename T = decltype(occupancy_t::static_query<E>())>
@ -165,20 +195,20 @@ namespace traits {
template <typename T>
struct static_query<T, execution::occupancy_t,
typename enable_if<
traits::query_static_constexpr_member<T,
execution::occupancy_t>::is_valid
execution::detail::occupancy_t<0>::
query_static_constexpr_member<T>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef typename traits::query_static_constexpr_member<T,
execution::occupancy_t>::result_type result_type;
typedef typename execution::detail::occupancy_t<0>::
query_static_constexpr_member<T>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member<T,
execution::occupancy_t>::value();
return execution::detail::occupancy_t<0>::
query_static_constexpr_member<T>::value();
}
};