writethresholdeventsource.h

来自「C++封装的视频采集代码」· C头文件 代码 · 共 47 行

#ifndef WRITETHRESHOLDEVENTSOURCE_H
#define WRITETHRESHOLDEVENTSOURCE_H

#include "WriteThresholdEventListener.h"
#include "Misc/Notifier.h"

namespace oxsemi
{
    namespace circular_buffer
    {
        template<typename T>
        class WriteThresholdEventSource : public Notifier<WriteThresholdEventListener>
        {
        public:
            WriteThresholdEventSource(int maxListeners);

            /**
             * @return A T giving the current value of the write threshold
             */
            virtual T GetWriteThreshold() const = 0;

            /**
             * @param threshold A T specifying the write fill level which when
             *  exceeded should cause any registered listeners to be notified.
             *  If the value given is zero, the registered listeners will be
             *  notified on every occasion where the test against fill level
             *  would have been made
             */
            virtual void SetWriteThreshold(T threshold) = 0;

            /**
             * @return A bool specifying whether the threshold is currently
             *  exceeded
             */
            virtual bool IsAboveWriteThreshold() const = 0;
        };

        template<typename T> WriteThresholdEventSource<T>::WriteThresholdEventSource(int maxListeners) :
            Notifier<WriteThresholdEventListener>(maxListeners)
        {
        }
    }
}

#endif        //  #if !defined(__WRITETHRESHOLDEVENTSOURCE_H__)