mirror of
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81 lines
2.5 KiB
C++
81 lines
2.5 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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template <typename... _ATy>
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struct Continuable
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{
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typedef Callback<Callback<_ATy...>&&> ForwardFunction;
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// Function 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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Continuable<_ATy...>() { }
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Continuable<_ATy...>(ForwardFunction&& callback_insert)
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: _callback_insert(std::forward<ForwardFunction>(callback_insert)) { }
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template <typename _CTy>
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Continuable<_ATy...>& then(_CTy&&)
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{
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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<Callback<_ATy...>&&>>
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{
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static auto CreateFrom(_FTy&& functional)
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-> Continuable<_ATy...>
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{
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return Continuable<_ATy...>(Callback<Callback<_ATy...>&&>(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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