Binary Compatibility Workarounds

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This page describes some workarounds for keeping binary compatibility in patch releases. You should read the KDE reference: Binary Compatibility Issues with C++.

Declaring a slot for private classes (d-pointer)

Use a Q_PRIVATE_SLOT:

 class A: public QObject
 {
 Q_OBJECT
 …
 private:
 Q_PRIVATE_SLOT(d_func(), void myPrivateSlot())
 };
 
/* in .cpp file */
 
 void APrivate::myPrivateSlot() {}
 
 #include "moc_a.cpp"

Pitfalls to avoid:

  • Don't include `a.moc`, but `moc_a.cpp` in your .cpp file
  • Q_PRIVATE_SLOT takes the complete signature of the private slot, not just its name