mirror of
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121 lines
3.9 KiB
C++
121 lines
3.9 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 _CALLBACK_H_
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#define _CALLBACK_H_
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#include <functional>
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#include <utility>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include "functional_unwrap.hpp"
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/// A general purpose void returing callback type (`std::function<void(Args...)>`).
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template<typename... Args>
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using Callback = std::function<void(Args...)>;
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/// A callback wrapped in a std::shared_ptr
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template<typename... Args>
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using SharedCallback = std::shared_ptr<Callback<Args...>>;
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/// A callback wrapped in a std::weak_ptr
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template<typename... Args>
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using WeakCallback = std::weak_ptr<Callback<Args...>>;
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namespace detail
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{
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template<typename Function>
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struct do_unwrap_callback;
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template<typename... _ATy>
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struct do_unwrap_callback<std::function<void(_ATy...)>>
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{
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typedef Callback<_ATy...> CallbackType;
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typedef SharedCallback<_ATy...> SharedCallbackType;
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typedef WeakCallback<_ATy...> WeakCallbackType;
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};
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template<typename _CTy>
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using unwrap_callback_t = do_unwrap_callback<::fu::function_type_of_t<typename std::decay<_CTy>::type>>;
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template<typename _CTy, typename... Args>
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struct WeakProxyFactory;
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template<typename _CTy, typename... Args>
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struct WeakProxyFactory<_CTy, std::weak_ptr<std::function<void(Args...)>>>
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{
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static Callback<Args...> CreateProxy(_CTy&& weak)
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{
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return [=](Args&&... args)
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{
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if (auto const callback = weak.lock())
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(*callback)(std::forward<Args>(args)...);
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};
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}
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};
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template<typename _CTy, typename... Args>
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struct WeakProxyFactory<_CTy, std::shared_ptr<std::function<void(Args...)>>>
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{
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static Callback<Args...> CreateProxy(_CTy&& shared)
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{
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return WeakProxyFactory<std::weak_ptr<std::function<void(Args...)>>&&,
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std::weak_ptr<std::function<void(Args...)>>>::CreateProxy(std::forward<_CTy>(shared));
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}
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};
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} // detail
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/// Unwraps the callback type of the given functional object.
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template<typename _CTy>
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using callback_of_t = typename detail::unwrap_callback_t<_CTy>::CallbackType;
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/// Unwraps the shared callback type of the given functional object.
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template<typename _CTy>
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using shared_callback_of_t = typename detail::unwrap_callback_t<_CTy>::SharedCallbackType;
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/// Unwraps the weak callback type of the given functional object.
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template<typename _CTy>
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using weak_callback_of_t = typename detail::unwrap_callback_t<_CTy>::WeakCallbackType;
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/// Creates a callback wrapped in a std::shared_ptr.
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template<typename _CTy>
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inline auto make_shared_callback(_CTy&& callback)
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-> shared_callback_of_t<_CTy>
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{
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return std::make_shared<callback_of_t<_CTy>>
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(std::forward<callback_of_t<_CTy>>(callback));
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};
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/// Creates a weak callback which wraps the given shared or weak callback.
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/// If the given managed callback expires the callback is not invoked anymore.
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template<typename _CTy>
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inline auto make_weak_wrapped_callback(_CTy&& callback)
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-> decltype(detail::WeakProxyFactory<_CTy, typename std::decay<_CTy>::type>::
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CreateProxy(std::declval<_CTy>()))
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{
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return detail::WeakProxyFactory<_CTy, typename std::decay<_CTy>::type>::
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CreateProxy(std::forward<_CTy>(callback));
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}
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#endif // _CALLBACK_H_
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