started working on template-policy based implementation of add_task().
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@ -52,6 +52,24 @@ class thread_pool
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/* the main loop of the threads */
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void loop();
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class place_front_policy
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{
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public:
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template <typename F, typename... Args>
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static void place(std::shared_ptr<std::packaged_task<decltype(std::declval<F>()(std::declval<Args>()...))>> task,
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std::deque<std::function<void()>>& queue, std::mutex& mu)
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{
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{
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std::lock_guard<std::mutex> lock(mu);
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queue.emplace_back([task](){ (*task)(); });
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}
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}
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};
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template <typename F, typename... Args, class placement_policy = place_front_policy>
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auto _add_task_internal(F&& f, Args&&... args) -> std::future<decltype(f(std::forward<Args>(args)...))>;
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public:
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/* construction & destruction */
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@ -89,6 +107,19 @@ public:
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};
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template <typename F, typename... Args, class placement_policy>
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auto thread_pool::_add_task_internal(F&& f, Args&&... args)
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-> std::future<decltype(f(std::forward<Args>(args)...))>
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{
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auto pckgd_tsk = std::make_shared<std::packaged_task<decltype(f(std::forward<Args>(args)...))()> >
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(std::bind(std::forward<F>(f), std::forward<Args>(args)...));
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placement_policy::place(pckgd_tsk, queue, mu);
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cond.notify_one();
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return pckgd_tsk->get_future();
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}
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thread_pool::thread_pool(size_t thcount):
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fin(false)
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{
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