timer.h

/********************************************************************
 * Copyright (C) 2015 Liangliang Nan <liangliang.nan@gmail.com>
 * https://3d.bk.tudelft.nl/liangliang/
 *
 * This file is part of Easy3D. If it is useful in your research/work,
 * I would be grateful if you show your appreciation by citing it:
 * ------------------------------------------------------------------
 *      Liangliang Nan.
 *      Easy3D: a lightweight, easy-to-use, and efficient C++ library
 *      for processing and rendering 3D data.
 *      Journal of Open Source Software, 6(64), 3255, 2021.
 * ------------------------------------------------------------------
 *
 * Easy3D is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 3
 * as published by the Free Software Foundation.
 *
 * Easy3D is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ********************************************************************/
 
#ifndef EASY3D_UTIL_TIMER_H
#define EASY3D_UTIL_TIMER_H
 
#include <thread>
#include <chrono>
#include <functional>
 
namespace easy3d {
 
    template<class... Args>
    class Timer {
    public:
        Timer() : stopped_(false), paused_(false) {}
 
        ~Timer() { stopped_ = true; }
 
        static void single_shot(int delay, std::function<void(Args...)> const &func, Args... args);
 
        template<class Class>
        static void single_shot(int delay, Class *inst, void (Class::*func)(Args...), Args... args);
 
        template<class Class>
        static void single_shot(int delay, Class const *inst, void (Class::*func)(Args...) const, Args... args);
 
        void set_timeout(int delay, std::function<void(Args...)> const &func, Args... args) const;
 
        template<class Class>
        void set_timeout(int delay, Class *inst, void (Class::*func)(Args...), Args... args) const;
 
        template<class Class>
        void set_timeout(int delay, Class const *inst, void (Class::*func)(Args...) const, Args... args) const;
 
        void set_interval(int interval, std::function<void(Args...)> const &func, Args... args) const;
 
        template<class Class>
        void set_interval(int interval, Class *inst, void (Class::*func)(Args...), Args... args) const;
 
        template<class Class>
        void set_interval(int interval, Class const *inst, void (Class::*func)(Args...) const, Args... args) const;
 
        void stop() { stopped_ = true; }
 
        bool is_stopped() const { return stopped_; }
 
        void pause() { paused_ = true; }
 
        bool is_paused() const { return paused_; }
 
        void resume() { if (!stopped_ && paused_) paused_ = false; }
 
    private:
        bool stopped_;
        bool paused_;
    };
 
 
 
    //-------------------------- IMPLEMENTATION ---------------------------
 
 
    template<class... Args>
    void Timer<Args...>::single_shot(int delay, std::function<void(Args...)> const &func, Args... args) {
        std::thread t([=]() {
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            func(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::single_shot(int delay, Class *inst, void (Class::*func)(Args...), Args... args) {
        std::thread t([=]() {
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            (inst->*func)(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::single_shot(int delay, Class const *inst, void (Class::*func)(Args...) const, Args... args) {
        std::thread t([=]() {
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            (inst->*func)(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    void Timer<Args...>::set_timeout(int delay, std::function<void(Args...)> const &func, Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            if (stopped_) return;
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            if (stopped_) return;
            func(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::set_timeout(int delay, Class *inst, void (Class::*func)(Args...), Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            if (stopped_) return;
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            if (stopped_) return;
            (inst->*func)(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::set_timeout(int delay, Class const *inst, void (Class::*func)(Args...) const, Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            if (stopped_) return;
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
            if (stopped_) return;
            (inst->*func)(args...);
        });
        t.detach();
    }
 
 
    template<class... Args>
    void Timer<Args...>::set_interval(int interval, std::function<void(Args...)> const &func, Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            while (true) {
                if (stopped_) return;
                std::this_thread::sleep_for(std::chrono::milliseconds(interval));
                if (paused_) continue;
                else if (stopped_) return;
                func(args...);
            }
        });
        t.detach();
    }
 
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::set_interval(int interval, Class *inst, void (Class::*func)(Args...), Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            while (true) {
                if (stopped_) return;
                std::this_thread::sleep_for(std::chrono::milliseconds(interval));
                if (paused_) continue;
                else if (stopped_) return;
                (inst->*func)(args...);
            }
        });
        t.detach();
    }
 
    template<class... Args>
    template<class Class>
    void Timer<Args...>::set_interval(int interval, Class const *inst, void (Class::*func)(Args...) const, Args... args) const {
        const_cast<Timer<Args...>*>(this)->stopped_ = false;
        std::thread t([=]() {
            while (true) {
                if (stopped_) return;
                std::this_thread::sleep_for(std::chrono::milliseconds(interval));
                if (paused_) continue;
                else if (stopped_) return;
                (inst->*func)(args...);
            }
        });
        t.detach();
    }
 
 
} // namespace easy3d
 
 
#endif  // EASY3D_UTIL_TIMER_H