qt-migration-legatus/qt5-before/dlbo/Lts/Viewer/SituationMap/Common/simple_value.h

/**
  * @RDE_HEADER@
  * Helper class for storing a simple value and an implizit changed flag
  * $Id$
  * $HeadURL$
  * $Author$
  */

#pragma once

// Qt

#include <sstream>

//----------------------------------------------------------------------------
namespace SituationMap
{


/*! \class SimpleValue
    \brief Simple storing fo values
 */
template <class TYPE> class SimpleValue
{
protected:
  TYPE m_value = TYPE();                 // '{}' to initialize the member (and avoid unconditional jumps@valgrind)
  bool m_changed = true;

public:
  SimpleValue() = default;
  // cppcheck-suppress noExplicitConstructor
  SimpleValue(const TYPE &value) // should not be declared explicit to avoid additional writing stuff to cast values
    : m_value(value)
  {}

  SimpleValue<TYPE> &operator=(const TYPE &newValue)
  {
    if (this->m_value != newValue)
    {
      this->m_value = newValue;
      m_changed     = true;
    }
    return *this;
  }

  const TYPE &operator()() const
  {
    return this->m_value;
  }

  const TYPE &value() const
  {
    return this->m_value;
  }

  TYPE &refValue()
  {
    m_changed = true;
    return this->m_value;
  }

  const TYPE &refValue() const
  {
    return this->m_value;
  }


  bool changed() const
  {
    return m_changed;
  }

  void reset()
  {
    m_changed = false;
  }

  void setChanged()
  {
    m_changed = true;
  }


  friend std::ostream &operator<<(std::ostream   &stream,
                                  const SimpleValue &simpleVal)
  {
    stream << simpleVal.value();
    return stream;
  }

};



} // namespace SituationMap