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Add friendship support to execution::execute CPO.

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This commit is contained in:
Christopher Kohlhoff 2021-01-06 11:42:48 +11:00
parent b239979692
commit 359632d9ae
1 changed files with 51 additions and 23 deletions
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74
asio/include/asio/execution/execute.hpp
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@ -86,6 +86,7 @@ void submit_helper(ASIO_MOVE_ARG(S) s, ASIO_MOVE_ARG(R) r);
} // namespace asio
namespace asio_execution_execute_fn {
using asio::conditional;
using asio::decay;
using asio::declval;
using asio::enable_if;
@ -109,27 +110,27 @@ enum overload_type
ill_formed
};
template <typename T, typename F, typename = void, typename = void,
typename = void, typename = void, typename = void>
template <typename Impl, typename T, typename F, typename = void,
typename = void, typename = void, typename = void, typename = void>
struct call_traits
{
ASIO_STATIC_CONSTEXPR(overload_type, overload = ill_formed);
};
template <typename T, typename F>
struct call_traits<T, void(F),
template <typename Impl, typename T, typename F>
struct call_traits<Impl, T, void(F),
typename enable_if<
execute_member<T, F>::is_valid
execute_member<typename Impl::template proxy<T>::type, F>::is_valid
>::type> :
execute_member<T, F>
execute_member<typename Impl::template proxy<T>::type, F>
{
ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member);
};
template <typename T, typename F>
struct call_traits<T, void(F),
template <typename Impl, typename T, typename F>
struct call_traits<Impl, T, void(F),
typename enable_if<
!execute_member<T, F>::is_valid
!execute_member<typename Impl::template proxy<T>, F>::is_valid
>::type,
typename enable_if<
execute_free<T, F>::is_valid
@ -139,10 +140,10 @@ struct call_traits<T, void(F),
ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free);
};
template <typename T, typename F>
struct call_traits<T, void(F),
template <typename Impl, typename T, typename F>
struct call_traits<Impl, T, void(F),
typename enable_if<
!execute_member<T, F>::is_valid
!execute_member<typename Impl::template proxy<T>::type, F>::is_valid
>::type,
typename enable_if<
!execute_free<T, F>::is_valid
@ -165,44 +166,68 @@ struct call_traits<T, void(F),
struct impl
{
template <typename T>
struct proxy
{
#if defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
struct type
{
template <typename F>
auto execute(ASIO_MOVE_ARG(F) f)
noexcept(
noexcept(
declval<typename conditional<true, T, F>::type>().execute(
ASIO_MOVE_CAST(F)(f))
)
)
-> decltype(
declval<typename conditional<true, T, F>::type>().execute(
ASIO_MOVE_CAST(F)(f))
);
};
#else // defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
typedef T type;
#endif // defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
};
template <typename T, typename F>
ASIO_CONSTEXPR typename enable_if<
call_traits<T, void(F)>::overload == call_member,
typename call_traits<T, void(F)>::result_type
call_traits<impl, T, void(F)>::overload == call_member,
typename call_traits<impl, T, void(F)>::result_type
>::type
operator()(
ASIO_MOVE_ARG(T) t,
ASIO_MOVE_ARG(F) f) const
ASIO_NOEXCEPT_IF((
call_traits<T, void(F)>::is_noexcept))
call_traits<impl, T, void(F)>::is_noexcept))
{
return ASIO_MOVE_CAST(T)(t).execute(ASIO_MOVE_CAST(F)(f));
}
template <typename T, typename F>
ASIO_CONSTEXPR typename enable_if<
call_traits<T, void(F)>::overload == call_free,
typename call_traits<T, void(F)>::result_type
call_traits<impl, T, void(F)>::overload == call_free,
typename call_traits<impl, T, void(F)>::result_type
>::type
operator()(
ASIO_MOVE_ARG(T) t,
ASIO_MOVE_ARG(F) f) const
ASIO_NOEXCEPT_IF((
call_traits<T, void(F)>::is_noexcept))
call_traits<impl, T, void(F)>::is_noexcept))
{
return execute(ASIO_MOVE_CAST(T)(t), ASIO_MOVE_CAST(F)(f));
}
template <typename T, typename F>
ASIO_CONSTEXPR typename enable_if<
call_traits<T, void(F)>::overload == adapter,
typename call_traits<T, void(F)>::result_type
call_traits<impl, T, void(F)>::overload == adapter,
typename call_traits<impl, T, void(F)>::result_type
>::type
operator()(
ASIO_MOVE_ARG(T) t,
ASIO_MOVE_ARG(F) f) const
ASIO_NOEXCEPT_IF((
call_traits<T, void(F)>::is_noexcept))
call_traits<impl, T, void(F)>::is_noexcept))
{
return asio::execution::detail::submit_helper(
ASIO_MOVE_CAST(T)(t),
@ -230,11 +255,14 @@ static ASIO_CONSTEXPR const asio_execution_execute_fn::impl&
} // namespace
typedef asio_execution_execute_fn::impl execute_t;
template <typename T, typename F>
struct can_execute :
integral_constant<bool,
asio_execution_execute_fn::call_traits<T, void(F)>::overload !=
asio_execution_execute_fn::ill_formed>
asio_execution_execute_fn::call_traits<
execute_t, T, void(F)>::overload !=
asio_execution_execute_fn::ill_formed>
{
};