ksEvent.h

/*************************************************************************
 * 
 * KINEMATICOUP CONFIDENTIAL
 * __________________
 * 
 *  Copyright (2016-2021) KinematicSoup Technologies Incorporated
 *  All Rights Reserved.
 * 
 * NOTICE:  All information contained herein is, and remains
 * the property of KinematicSoup Technologies Incorporated and its 
 * suppliers, if any.  The intellectual and technical concepts contained
 * herein are proprietary to KinematicSoup Technologies Incorporated
 * and its suppliers and may be covered by Canadian and Foreign Patents,
 * patents in process, and are protected by trade secret or copyright law.
 * Dissemination of this information or reproduction of this material
 * is strictly forbidden unless prior written permission is obtained
 * from KinematicSoup Technologies Incorporated.
 */
#pragma once
 
#include <memory>
#include <functional>
 
namespace KS {
    template<typename ...Arguments>
    class ksEvent
    {
    public:
        typedef std::function<void(Arguments...)> Handler;
        typedef std::shared_ptr<ksEvent<Arguments...>> SPtr;
        typedef std::weak_ptr<ksEvent<Arguments...>> WPtr;
 
        static SPtr CreateSPtr(Handler callback)
        {
            return std::make_shared<ksEvent<Arguments...>>(callback);
        }
 
        ksEvent(Handler callback)
            : m_callback{ callback } 
        {
        }
        
        virtual ~ksEvent()
        {
        }
 
        bool IsExpired()
        {
            return (m_callback == nullptr);
        }
 
    private:
        Handler m_callback;
        template<typename ...T> friend class EventSystem;
 
        void Reset()
        {
            m_callback = nullptr;
        }
 
        void operator()(Arguments&&... args)
        {
            if (m_callback) {
                m_callback(std::forward<Arguments>(args)...);
            }
        }
    };
} // KS