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100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
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/*
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/~` _ _ _|_. _ _ |_ | _
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\_,(_)| | | || ||_|(_||_)|(/_
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https://github.com/Naios/continuable
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v4.0.0
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Copyright(c) 2015 - 2019 Denis Blank <denis.blank at outlook dot com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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**/
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#ifndef CONTINUABLE_DETAIL_RESULT_TRAIT_HPP_INCLUDED
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#define CONTINUABLE_DETAIL_RESULT_TRAIT_HPP_INCLUDED
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include <continuable/detail/core/annotation.hpp>
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#include <continuable/detail/utility/traits.hpp>
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#include <continuable/detail/utility/util.hpp>
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namespace cti {
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namespace detail {
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template <typename... T>
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struct result_trait;
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template <>
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struct result_trait<> {
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using value_t = void;
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struct surrogate_t {};
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static constexpr surrogate_t wrap() noexcept {
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return {};
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}
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static constexpr void unwrap(surrogate_t) {
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}
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};
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template <typename T>
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struct result_trait<T> {
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using value_t = T;
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using surrogate_t = value_t;
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static surrogate_t wrap(T arg) {
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return std::move(arg);
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}
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template <typename R>
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static decltype(auto) unwrap(R&& unwrap) {
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return std::forward<R>(unwrap);
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}
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template <std::size_t I, typename Result>
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static decltype(auto) get(Result&& result) {
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return std::forward<Result>(result).get_value();
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}
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};
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template <typename First, typename Second, typename... Rest>
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struct result_trait<First, Second, Rest...> {
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using value_t = std::tuple<First, Second, Rest...>;
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using surrogate_t = value_t;
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static surrogate_t wrap(First first, Second second, Rest... rest) {
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return std::make_tuple(std::move(first), std::move(second),
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std::move(rest)...);
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}
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template <typename R>
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static decltype(auto) unwrap(R&& unwrap) {
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return std::forward<R>(unwrap);
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}
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template <std::size_t I, typename Result>
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static decltype(auto) get(Result&& result) {
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return std::get<I>(std::forward<Result>(result).get_value());
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}
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};
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} // namespace detail
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} // namespace cti
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#endif // CONTINUABLE_DETAIL_RESULT_TRAIT_HPP_INCLUDED
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