Changes to Qt Core

Qt 6 is a result of the conscious effort to make the framework more efficient and easy to use.

We try to maintain binary and source compatibility for all the public APIs in each release. But some changes were inevitable in an effort to make Qt a better framework.

In this topic we summarize those changes in Qt Core, and provide guidance to handle them.

I. Container Classes

I-1. QHash, QMultiHash, QSet

I-1-1. qHash() Signature