Can't make Q_INVOKABLE macro use compile

[frankiefrank]

I'm trying to create an object for use for QML integration.

If I uncomment the marked code, I get compilation errors:

// header
#ifndef MY_QML_INTERFACE_H
#define MY_QML_INTERFACE_H
 
#include <QObject>
#include <QDateTime>
 
class MyQmlInterface : public QObject
{
	Q_OBJECT
 
public:	
 
	Q_PROPERTY(QString singleValue READ singleValue WRITE setSingleValue NOTIFY singleValueChanged);
 
	const QString &singleValue() const;
	void setSingleValue(const QString &newSingleValue);
 
	/* THIS CODE WON't COMPILE
	Q_INVOKABLE QDateTime getCurrentDateTime() const {
         return QDateTime::currentDateTime();
		 */
 
signals:
	void singleValueChanged();
private:
	QString mSingleValue;
};
 
#endif
 
// Cpp
#include "MyQmlInterface.h"
 
const QString &MyQmlInterface::singleValue() const 
{
	return mSingleValue;
}
 
void MyQmlInterface::setSingleValue(const QString &newSingleValue)
{
	if (newSingleValue == mSingleValue)
		return;
	mSingleValue = newSingleValue;
	emit singleValueChanged();
}

// header
#ifndef MY_QML_INTERFACE_H
#define MY_QML_INTERFACE_H

#include <QObject>
#include <QDateTime>

class MyQmlInterface : public QObject
{
	Q_OBJECT

public:	

	Q_PROPERTY(QString singleValue READ singleValue WRITE setSingleValue NOTIFY singleValueChanged);
	
	const QString &singleValue() const;
	void setSingleValue(const QString &newSingleValue);

	/* THIS CODE WON't COMPILE
	Q_INVOKABLE QDateTime getCurrentDateTime() const {
         return QDateTime::currentDateTime();
		 */

signals:
	void singleValueChanged();
private:
	QString mSingleValue;
};

#endif

// Cpp
#include "MyQmlInterface.h"

const QString &MyQmlInterface::singleValue() const 
{
	return mSingleValue;
}

void MyQmlInterface::setSingleValue(const QString &newSingleValue)
{
	if (newSingleValue == mSingleValue)
		return;
	mSingleValue = newSingleValue;
	emit singleValueChanged();
}

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Any idea why this doesn't work?

[wysota]

What is the error you get? Did you remember to run qmake?

[frankiefrank]

This is happening in visual studio.

I get this warning in the output:
"MyQmlInterface.h(28): Warning: No relevant classes found. No output generated."
And then a bunch of compilation errors for different classes of mine.

[wysota]

The code looks correct. Could you prepare a minimal compilable (well, almost) example reproducing the problem?

[stampede]

I assume the closing bracket is not missing in your final code ?

/* THIS CODE WON't COMPILE
	Q_INVOKABLE QDateTime getCurrentDateTime() const {
         return QDateTime::currentDateTime();
	} // <- this closing bracket	 */

/* THIS CODE WON't COMPILE
	Q_INVOKABLE QDateTime getCurrentDateTime() const {
         return QDateTime::currentDateTime();
	} // <- this closing bracket	 */

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[frankiefrank]

Thank you stampede! Goddamit! :-)

And thanks wysota for your time as well!