/*
 * DoubleBuffer.hpp
 *
 *  Created on: 15 мар. 2021 г.
 *      Author: titov
 */

#ifndef UMLIBRARY_COMMON_DOUBLEBUFFER_HPP_
#define UMLIBRARY_COMMON_DOUBLEBUFFER_HPP_

#include <utility>

template<typename V>
class DoubleBuffer {

    bool flag = false;
    std::pair<V, V> data;

public:
    void write( V v );
    V read() const;
};

template<typename V>
inline void DoubleBuffer<V>::write( V v ) {

    ( flag ? data.second : data.first ) = v;
    flag = not flag;

}

template<typename V>
inline V DoubleBuffer<V>::read() const {

    return flag ? data.first : data.second;

}

#endif /* UMLIBRARY_COMMON_DOUBLEBUFFER_HPP_ */