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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
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// Copyright (c) OpenMMLab. All rights reserved.
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// Modified from
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// https://github.com/brycelelbach/wg21_p2300_std_execution/blob/main/include/execution.hpp
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#ifndef MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_JUST_H_
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#define MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_JUST_H_
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#include <tuple>
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#include "concepts.h"
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#include "utility.h"
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namespace mmdeploy {
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namespace __just {
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template <typename Receiver, typename... Ts>
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struct _Operation {
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struct type;
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};
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template <typename Receiver, typename... Ts>
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using operation_t = typename _Operation<remove_cvref_t<Receiver>, Ts...>::type;
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template <typename Receiver, typename... Ts>
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struct _Operation<Receiver, Ts...>::type {
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std::tuple<Ts...> values_;
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Receiver receiver_;
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friend void tag_invoke(start_t, type& op_state) noexcept {
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std::apply(
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[&](Ts&... ts) -> void { SetValue(std::move(op_state.receiver_), std::move(ts)...); },
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op_state.values_);
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}
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};
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template <typename... Ts>
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struct _Sender {
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struct type;
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};
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template <typename... Ts>
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using sender_t = typename _Sender<std::decay_t<Ts>...>::type;
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template <typename... Ts>
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struct _Sender<Ts...>::type {
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using value_types = std::tuple<Ts...>;
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value_types values_;
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template <typename Receiver>
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friend operation_t<Receiver, Ts...> tag_invoke(connect_t, const type& self, Receiver&& receiver) {
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return {self.values_, (Receiver &&) receiver};
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}
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template <typename Receiver>
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friend operation_t<Receiver, Ts...> tag_invoke(connect_t, type&& self, Receiver&& receiver) {
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return {std::move(self).values_, (Receiver &&) receiver};
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}
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};
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struct just_t {
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template <typename... Ts>
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sender_t<Ts...> operator()(Ts&&... ts) const {
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return {{(Ts &&) ts...}};
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}
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};
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} // namespace __just
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using __just::just_t;
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inline constexpr just_t Just{};
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} // namespace mmdeploy
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#endif // MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_JUST_H_
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