Signal/Slots with PIMPL

[high_flyer]

You can declare it the cpp file but then add

For that you first need to have the moc file, which is generated by the moc compiler...
If you want to use Q_OBJECT you will have first to have this in a header, run moc on it, and then add #include "foo.moc".
AFAIK at least.

[Lykurg]

On my side this works perfect:

//main.cpp
#include <QtCore>
#include "outer.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    Outer o;
    QTimer::singleShot(1000, &a, SLOT(quit()));
 
    return a.exec();
}

//main.cpp
#include <QtCore>
#include "outer.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    Outer o;
    QTimer::singleShot(1000, &a, SLOT(quit()));

    return a.exec();
}

To copy to clipboard, switch view to plain text mode 

//outer.h
#ifndef OUTER_H
#define OUTER_H
 
#include <QObject>
class Inner;
 
class Outer : public QObject
{
    Q_OBJECT
public:
    explicit Outer(QObject *parent = 0);
public Q_SLOTS:
    void mySlot();
private:
    Inner* m_inner;
};
 
#endif // OUTER_H

//outer.h
#ifndef OUTER_H
#define OUTER_H

#include <QObject>
class Inner;

class Outer : public QObject
{
    Q_OBJECT
public:
    explicit Outer(QObject *parent = 0);
public Q_SLOTS:
    void mySlot();
private:
    Inner* m_inner;
};

#endif // OUTER_H

To copy to clipboard, switch view to plain text mode 

//outer.cpp
#include "outer.h"
 
#include <QtCore>
 
 
class Inner : public QObject
{
    Q_OBJECT
public:
    Inner(QObject *p) : QObject(p) {}
Q_SIGNALS:
    void mySignal();
public:
    void emitMySignal() {Q_EMIT mySignal();}
};
 
Outer::Outer(QObject *parent) :
    QObject(parent)
{
    m_inner = new Inner(this);
    connect(m_inner, SIGNAL(mySignal()), this, SLOT(mySlot()));
    m_inner->emitMySignal();
}
 
void Outer::mySlot()
{
    qWarning() << Q_FUNC_INFO;
}
 
#include "outer.moc"

//outer.cpp
#include "outer.h"

#include <QtCore>


class Inner : public QObject
{
    Q_OBJECT
public:
    Inner(QObject *p) : QObject(p) {}
Q_SIGNALS:
    void mySignal();
public:
    void emitMySignal() {Q_EMIT mySignal();}
};

Outer::Outer(QObject *parent) :
    QObject(parent)
{
    m_inner = new Inner(this);
    connect(m_inner, SIGNAL(mySignal()), this, SLOT(mySlot()));
    m_inner->emitMySignal();
}

void Outer::mySlot()
{
    qWarning() << Q_FUNC_INFO;
}

#include "outer.moc"

To copy to clipboard, switch view to plain text mode 

And don't forget to rerun qmake...