How can i correctly make the definition of class in cpp

dzeko1236 (18)
Hello ,
I am really new in c++ development .

I created a class Backend .

In Backend.h I defined a constructor .
So I would like t redefine correctly my class In Backend.cpp

thank you
dzeko1236 (18)
this is the def in Backend.h
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public:
    Backend(QObject *parent = nullptr): QObject(parent), m_fetchFrameTimer(this){
        connect(&m_fetchFrameTimer, & QTimer::timeout, this, &Backend::fetchNextDataFrame);
        m_fetchFrameTimer.setSingleShot(true);

        m_canDevice = QCanBus::instance()->createDevice(QStringLiteral("socketcan"), QStringLiteral("can0"));
        connect(m_canDevice, &QCanBusDevice::framesReceived, this, &Backend::onFramesReceived);
        connect(m_canDevice, &QCanBusDevice::framesWritten, this, &Backend::onFramesWritten);
    }




In my Backend.cpp ,
I tried this :

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Backend::Backend(QObject *parent ) :QObject(parent), m_fetchFrameTimer(new QTimer(this))

{
keskiverto (10402)
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// class definition
class Backend {

public:
  Backend( QObject *parent = nullptr ); // member declaration

};


// function definition (aka implementation)
Backend::Backend( QObject *parent )
 : QObject(parent), m_fetchFrameTimer(this)
{
  connect(&m_fetchFrameTimer, & QTimer::timeout, this, &Backend::fetchNextDataFrame);
  m_fetchFrameTimer.setSingleShot(true);

  m_canDevice = QCanBus::instance()->createDevice(QStringLiteral("socketcan"), QStringLiteral("can0"));
  connect(m_canDevice, &QCanBusDevice::framesReceived, this, &Backend::onFramesReceived);
  connect(m_canDevice, &QCanBusDevice::framesWritten, this, &Backend::onFramesWritten);
}
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