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First conversion into if constexpr

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This commit is contained in:
Denis Blank 2018-03-12 13:57:17 +01:00
parent 14ebb40756
commit 0da0dca385
1 changed files with 16 additions and 20 deletions
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36
include/continuable/detail/connection-aggregated.hpp
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@ -198,20 +198,25 @@ constexpr auto unbox_continuables(Args&&... args) {
std::forward<Args>(args)...); std::forward<Args>(args)...);
} }
namespace detail {
template <typename Callback, typename Data> template <typename Callback, typename Data>
constexpr auto finalize_impl(traits::identity<void>, Callback&& callback, constexpr auto finalize_data(Callback&& callback, Data&& data) {
Data&&) { using result_t = decltype(unbox_continuables(std::forward<Data>(data)));
return std::forward<Callback>(callback)();
} // Guard the final result against void
template <typename... Args, typename Callback, typename Data> return CONTINUABLE_IF_CONSTEXPR(
constexpr auto finalize_impl(traits::identity<std::tuple<Args...>>, std::is_void<result_t>::value,
Callback&& callback, Data&& data) { {
// Call the final callback with the cleaned result // Just invoke the callback with zero arguments
return traits::unpack(unbox_continuables(std::forward<Data>(data)), return std::forward<Callback>(callback)();
std::forward<Callback>(callback)); },
{
// Call the final callback with the cleaned result
return traits::unpack(unbox_continuables(std::forward<Data>(data)),
std::forward<Callback>(callback));
});
} }
namespace detail {
struct hint_mapper { struct hint_mapper {
template <typename... T> template <typename... T>
constexpr auto operator()(T...) -> hints::signature_hint_tag<T...> { constexpr auto operator()(T...) -> hints::signature_hint_tag<T...> {
@ -220,15 +225,6 @@ struct hint_mapper {
}; };
} // namespace detail } // namespace detail
template <typename Callback, typename Data>
constexpr auto finalize_data(Callback&& callback, Data&& data) {
using result_t = decltype(unbox_continuables(std::forward<Data>(data)));
// Guard the final result against void
return detail::finalize_impl(traits::identity<std::decay_t<result_t>>{},
std::forward<Callback>(callback),
std::forward<Data>(data));
}
template <typename Data> template <typename Data>
constexpr auto hint_of_data() { constexpr auto hint_of_data() {
return decltype(finalize_data(detail::hint_mapper{}, std::declval<Data>())){}; return decltype(finalize_data(detail::hint_mapper{}, std::declval<Data>())){};