Binary Compatibility Workarounds: Difference between revisions

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[[Category:Developing_Qt::Guidelines]]


[[Category:Developing_Qt]]
This page describes some workarounds for keeping binary compatibility in patch releases. You should read the KDE reference: [https://community.kde.org/Policies/Binary_Compatibility_Issues_With_C%2B%2B Binary Compatibility Issues with C++].


= Binary Compatibility Workarounds =
Specifically, the d-pointer technique is explained in much detail in [[D-Pointer|D-Pointer: What Private Implementation is and how it works]].
 
This page describes some workarounds for keeping binary compatibility in patch releases.
 
You should read the KDE reference: http://techbase.kde.org/Policies/Binary_Compatibility_Issues_With_C++


== Declaring a slot for private classes (d-pointer) ==
== Declaring a slot for private classes (d-pointer) ==
Line 13: Line 9:
Use a Q_PRIVATE_SLOT:
Use a Q_PRIVATE_SLOT:


<code>
<code lang="cpp">
  class A: public QObject
  class A: public QObject
  {
  {
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Pitfalls to avoid:
Pitfalls to avoid:


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

Latest revision as of 13:43, 25 August 2017


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

Specifically, the d-pointer technique is explained in much detail in D-Pointer: What Private Implementation is and how it works.

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