OnChangeChannel.hpp

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// ======================================================================
// \title  OnChangeChannel.hpp
// \author Rob Bocchino
// \brief  A model of an on-change channel for testing
//
// \copyright
// Copyright (C) 2023 California Institute of Technology.
// ALL RIGHTS RESERVED.  United States Government Sponsorship
// acknowledged. Any commercial use must be negotiated with the Office
// of Technology Transfer at the California Institute of Technology.
// ======================================================================
 
#ifndef TestUtils_OnChangeChannel_HPP
#define TestUtils_OnChangeChannel_HPP
 
#include <FpConfig.hpp>
#include <cstring>
 
#include "TestUtils/Option.hpp"
 
namespace TestUtils {
 
enum class OnChangeStatus { CHANGED, NOT_CHANGED };
 
template <typename T>
class OnChangeChannel {
  public:
    explicit OnChangeChannel(T value) : value(value) {}
    OnChangeStatus updatePrev() {
        const auto status = ((!this->prev.hasValue()) || (this->value != this->prev.get()))
                                ? OnChangeStatus::CHANGED
                                : OnChangeStatus::NOT_CHANGED;
        this->prev.set(this->value);
        return status;
    }
 
  public:
    T value;
 
  private:
    Option<T> prev;
};
 
}  // namespace TestUtils
 
#endif