Access from other class

Hi

I have these files in my project:

/home/myproj/lib/myPlugin.h

Code:

---

class MYPROJ_EXPORT myPlugin : public QObject
{
    Q_OBJECT
 
 public:
    virtual ~myPlugin();
    virtual myPlugin * newInstance() const = 0;
    virtual qreal speed() const;
    virtual qreal direction() const;
 
 protected:
    myPlugin();
 
 private:
    Q_DISABLE_COPY( myPlugin )
};
 
}

---

/home/myproj/lib/myPlugin.cpp

Code:

---

#include "PositionProviderPlugin.h"
 
 
 
myProj::myPlugin::myPlugin()
{
}
 
myProj::myPlugin::~myPlugin()
{
}
 
qreal myProj::myPlugin::speed()
{
}
 
qreal myProj::myPlugin::direction()
{
}
#include "myPlugin.moc"

---

When I compile I get this error:

error: prototype for ‘qreal myProj::myPlugin::speed()’ does not match any in class ‘myProj::PositionProviderPlugin’
error: candidate is: virtual qreal myProj::myPlugin::speed() const

error: prototype for ‘qreal myProj::myPlugin::direction()’ does not match any in class ‘my::PositionProviderPlugin’
error: candidate is: virtual qreal myProj::myPlugin::direction() const

How can I correct this ?

add const to your definition! (as the error message says...)

Code:

---

qreal myProj::myPlugin::speed() const
{
}

---

Your compiler is telling you everything you need to know. Function signatures must match EXACTLY, and your's don't, because you've dropped the 'const' specification from the implementation, just as the error message points out.