Access from other class

[champ]

Hi

I have these files in my project:

/home/myproj/lib/myPlugin.h

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 )
};
 
}

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 )
};

}

To copy to clipboard, switch view to plain text mode 

/home/myproj/lib/myPlugin.cpp

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

#include "PositionProviderPlugin.h"



myProj::myPlugin::myPlugin()
{
}

myProj::myPlugin::~myPlugin()
{
}

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

qreal myProj::myPlugin::direction()
{
}
#include "myPlugin.moc"

To copy to clipboard, switch view to plain text mode 

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 ?

[Lykurg]

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

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

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

To copy to clipboard, switch view to plain text mode 

[SixDegrees]

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.