Try to emit signal in keyPressEvent

[Evgeny Siberia]

Hi. Why do I have errors? What is my mistake?
The first in constructor: undefined reference to `vtable for LineEditClickedButton;
And others in keyPressEvent: undefined reference to LineEditClickedButton::buttonPressed

#include <QLineEdit>

class LineEditClickedButton : public QLineEdit
{
    Q_OBJECT
public:
    explicit LineEditClickedButton(QWidget *parent = nullptr);

protected:
    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;

signals:
    void buttonPressed(QString button);
};

#include "lineeditclickedbutton.h"
#include <QKeyEvent>

LineEditClickedButton::LineEditClickedButton(QWidget *parent) :
    QLineEdit(parent)
{}

void LineEditClickedButton::keyPressEvent(QKeyEvent *e)
{
    switch (e->key()) {
    case Qt::Key_Escape:
        emit buttonPressed("esc");
        break;
    case Qt::Key_Tab:
        emit buttonPressed("tab");
        break;
    }
    QLineEdit::keyPressEvent(e);
}

[JonB]

@Evgeny-Siberia
Since I can't spot anything: have you cleaned out all intermeditae files in the compilation output directory and rebuilt? Especially if you have recently added the Q_OBJECT. At least make sure the error remains.

[kshegunov]

Besides what @JonB said, is this in a library?

Also a piece of advice stick to const <Type> & for signal types.