mirror of
https://github.com/Naios/continuable.git
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152 lines
4.2 KiB
C++
152 lines
4.2 KiB
C++
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/*
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* Copyright (C) 2015 Naios <naios-dev@live.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _CONTINUABLE_H_
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#define _CONTINUABLE_H_
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#include "Callback.h"
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namespace detail
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{
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} // detail
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template <typename... Args>
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struct ContinuableState;
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template <typename... Args>
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struct ContinuableState<Args...>
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{
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};
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template <typename _CTy, typename _State = ContinuableState<>>
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class Continuable;
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template <typename... _ATy, typename _State>
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class Continuable<std::function<void(_ATy...)>, _State>
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{
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public:
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typedef std::function<void(Callback<_ATy...>&&)> ForwardFunction;
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private:
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// Functional which expects a callback that is inserted from the Continuable
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// to chain everything together
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ForwardFunction _callback_insert;
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bool _released;
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void Dispatch()
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{
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}
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public:
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/// Deleted copy construct
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template <typename _RCTy, typename _RState>
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explicit Continuable(Continuable<_RCTy, _RState> const&) = delete;
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/// Move construct
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template <typename _RCTy, typename _RState>
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explicit Continuable(Continuable<_RCTy, _RState>&& right)
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: _released(right._released)
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{
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right._released = true;
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}
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// Construct through a ForwardFunction
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template<typename _FTy>
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Continuable(_FTy&& callback_insert)
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: _callback_insert(std::forward<_FTy>(callback_insert)), _released(false) { }
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/// Destructor which calls the dispatch chain if needed.
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~Continuable()
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{
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if (!_released)
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{
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_released = true;
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Dispatch();
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}
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}
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/// Deleted copy assign
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template <typename _RCTy, typename _RState>
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Continuable& operator= (Continuable<_RCTy, _RState> const&) = delete;
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/// Move construct assign
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template <typename _RCTy, typename _RState>
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Continuable& operator= (Continuable<_RCTy, _RState>&& right)
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{
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_released = right._released;
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right._released = true;
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return *this;
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}
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// TODO Accept only correct callbacks
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template <typename _CTy>
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Continuable<Callback<_ATy...>> then(_CTy&&)
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{
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// TODO Transmute the returned callback here.
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return Continuable<Callback<_ATy...>>(std::move(*this));
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}
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/// Invalidates the Continuable
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Continuable& invalidate()
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{
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_released = true;
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return *this;
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}
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};
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namespace detail
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{
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template <typename _FTy, typename _RTy, typename... _ATy>
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struct ContinuableFactory;
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template <typename _FTy, typename _RTy, typename... _ATy>
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struct ContinuableFactory<_FTy, _RTy, ::fu::identity<std::function<void(_ATy...)>&&>>
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{
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static auto CreateFrom(_FTy&& functional)
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-> Continuable<Callback<_ATy...>>
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{
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return Continuable<Callback<_ATy...>>(
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typename Continuable<Callback<_ATy...>>::ForwardFunction(std::forward<_FTy>(functional)));
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}
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};
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template <typename _FTy>
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using continuable_factory_t = ContinuableFactory<
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_FTy, ::fu::return_type_of_t<_FTy>, ::fu::argument_type_of_t<_FTy>>;
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} // detail
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/// Wraps a functional object which expects a r-value callback as argument into a continuable.
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/// The callable is invoked when the continuable shall continue.
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/// For example:
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/// make_continuable([](Callback<int>&& callback)
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/// {
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/// /* Continue here */
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/// callback(5);
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/// });
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template <typename _FTy>
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inline auto make_continuable(_FTy&& functional)
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-> decltype(detail::continuable_factory_t<_FTy>::CreateFrom(std::declval<_FTy>()))
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{
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return detail::continuable_factory_t<_FTy>::CreateFrom(std::forward<_FTy>(functional));
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}
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#endif // _CONTINUABLE_H_
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