Problem with QFlags and macro Q_DECLARE_FLAGS - typedef cannot be seen.

[miqqo]

Hi everyone, is there anybody who can help me with follwoing problem? I would like to use QFlags class. When compiling below code i get error.

#ifndef OBJECTQ_H
#define OBJECTQ_H
 
#include <QtCore/qglobal.h>
#include <QtCore/qobject.h>
 
class Objectq : public QObject
{
public:
    enum MyEnum
    {
        Enum1 = 0x0,
        Enum2 = 0x1
    };
    Q_DECLARE_FLAGS(MyEnums, MyEnum)
    Objectq();
    MyEnums flags() const;
 
private:
    MyEnums mFlags;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(Objectq::MyEnums);
 
#endif // OBJECTQ_H

#ifndef OBJECTQ_H
#define OBJECTQ_H

#include <QtCore/qglobal.h>
#include <QtCore/qobject.h>

class Objectq : public QObject
{
public:
    enum MyEnum
    {
        Enum1 = 0x0,
        Enum2 = 0x1
    };
    Q_DECLARE_FLAGS(MyEnums, MyEnum)
    Objectq();
    MyEnums flags() const;

private:
    MyEnums mFlags;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(Objectq::MyEnums);

#endif // OBJECTQ_H

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The compiler output is following:

..\Flagi\objectq.cpp(7) : error C2143: syntax error : missing ';' before 'Objectq::flags' 
..\Flagi\objectq.cpp(7) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 
..\Flagi\objectq.cpp(8) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 
..\Flagi\objectq.cpp(8) : error C2556: 'int Objectq::flags(void) const' : overloaded function differs only by return type from 'Objectq::MyEnums Objectq::flags(void) const' 
c:\users\lukasz\workspace\flagi\objectq.h(17) : see declaration of 'Objectq::flags' 
..\Flagi\objectq.cpp(8) : error C2371: 'Objectq::flags' : redefinition; different basic types 
c:\users\lukasz\workspace\flagi\objectq.h(17) : see declaration of 'Objectq::flags'

..\Flagi\objectq.cpp(7) : error C2143: syntax error : missing ';' before 'Objectq::flags' 
..\Flagi\objectq.cpp(7) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 
..\Flagi\objectq.cpp(8) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 
..\Flagi\objectq.cpp(8) : error C2556: 'int Objectq::flags(void) const' : overloaded function differs only by return type from 'Objectq::MyEnums Objectq::flags(void) const' 
c:\users\lukasz\workspace\flagi\objectq.h(17) : see declaration of 'Objectq::flags' 
..\Flagi\objectq.cpp(8) : error C2371: 'Objectq::flags' : redefinition; different basic types 
c:\users\lukasz\workspace\flagi\objectq.h(17) : see declaration of 'Objectq::flags'

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It seems that in method MyEnums flags() const; type MyEnums isn't visible, but I don't have idea why. According to QT documentation macro Q_DECLARE_FLAGS should do the job, but it isn't. I've spent a lot of time trying to get known what's is wrong, now it's time to ask for help somone clever than me .

[tbscope]

The errors you posted are from the cpp file, not the header file.
Please post the code of the cpp file.

And please read the error messages from top to bottom. The most obvious problem (and this will reduce a lot of errors) is the missing ; at line 7

[miqqo]

I doubt that it is a matter a cpp file, it is very simple test class only:

objectq.cpp:

#include "objectq.h"
 
Objectq::Objectq()
{
}
 
MyEnums Objectq::flags() const
{
    return mFlags;
}

#include "objectq.h"

Objectq::Objectq()
{
}

MyEnums Objectq::flags() const
{
    return mFlags;
}

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#include "objectq.h"

Objectq::Objectq()
{
}

MyEnums Objectq::flags() const
{
return mFlags;
}

[tbscope]

Use

Objectq::MyEnums

Objectq::MyEnums

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everywhere instead of just MyEnums.

[jkyle]

Don't you need to have the Q_OBJECT macro first?

[tbscope]

Don't you need to have the Q_OBJECT macro first?

No, flags can also be used in non QObject based classes. See the example in the QFlags documentation.