127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
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#pragma once
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#if !defined(MIJIN_ASYNC_SIGNAL_HPP_INCLUDED)
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#define MIJIN_ASYNC_SIGNAL_HPP_INCLUDED 1
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#include <cstdint>
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#include <functional>
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#include <memory>
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#include <mutex>
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#include <vector>
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#include "../util/flag.hpp"
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namespace mijin
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{
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//
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// public defines
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//
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//
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// public constants
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//
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//
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// public types
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//
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MIJIN_DEFINE_FLAG(Oneshot);
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template<typename... TArgs>
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class Signal
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{
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public:
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using handler_t = std::function<void(TArgs...)>;
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using token_t = std::uint32_t;
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private:
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struct RegisteredHandler
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{
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handler_t callable;
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std::weak_ptr<void> referenced;
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token_t token;
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Oneshot oneshot = Oneshot::NO;
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};
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using handler_vector_t = std::vector<RegisteredHandler>;
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private:
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handler_vector_t handlers_;
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token_t nextToken = 1;
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std::mutex handlersMutex_;
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public:
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Signal() = default;
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Signal(const Signal&) = delete;
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Signal(Signal&&) noexcept = default;
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public:
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Signal& operator=(const Signal&) = delete;
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Signal& operator=(Signal&&) noexcept = default;
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public:
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template<typename THandler, typename TWeak = void>
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inline token_t connect(THandler handler, Oneshot oneshot = Oneshot::NO, std::weak_ptr<TWeak> referenced = std::weak_ptr<TWeak>()) noexcept;
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inline void disconnect(token_t token) noexcept;
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inline void emit(TArgs&&... args) noexcept;
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};
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//
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// public functions
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//
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template<typename... TArgs>
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template<typename THandler, typename TWeak>
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inline auto Signal<TArgs...>::connect(THandler handler, Oneshot oneshot, std::weak_ptr<TWeak> referenced) noexcept -> token_t
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{
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std::lock_guard lock(handlersMutex_);
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auto callable = handler_t(handler);
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handlers_.push_back({
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.callable = std::move(callable),
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.referenced = std::move(referenced),
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.token = nextToken,
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.oneshot = oneshot
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});
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return nextToken++;
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}
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template<typename... TArgs>
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inline void Signal<TArgs...>::disconnect(token_t token) noexcept
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{
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std::lock_guard lock(handlersMutex_);
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auto it = std::remove_if(handlers_.begin(), handlers_.end(), [token](const RegisteredHandler& handler)
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{
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return handler.token == token;
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});
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handlers_.erase(it, handlers_.end());
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}
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template<typename... TArgs>
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inline void Signal<TArgs...>::emit(TArgs&&... args) noexcept
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{
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std::lock_guard lock(handlersMutex_);
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// first erase any handlers with expired references
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// auto it = std::remove_if(handlers_.begin(), handlers_.end(), [](const RegisteredHandler& handler)
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// {
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// return handler.referenced.expired();
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// });
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// handlers_.erase(it, handlers_.end());
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// TODO: this doesn't really work since expired() also returns true if the pointer was never set
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// invoke all handlers
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for (RegisteredHandler& handler : handlers_)
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{
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handler.callable(forward<TArgs>(args)...);
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}
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// remove any oneshot
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auto it = std::remove_if(handlers_.begin(), handlers_.end(), [](const RegisteredHandler& handler)
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{
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return handler.oneshot;
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});
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handlers_.erase(it, handlers_.end());
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}
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} // namespace mijin
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#endif // !defined(MIJIN_ASYNC_SIGNAL_HPP_INCLUDED)
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