Qt foreach loop ordering vs. for loop for QList

The foreach macro (aka. Q_FOREACH) uses the begin() and end() iterator request methods of the container.

So if your container is a QList or QVector then your examples will always be equivalent. You can view the foreach source code here.

The foreach macro isn't great though, it makes a copy of the container - so only use on containers that support implicit-sharing. Use C++11 for( : ) {} loops if available, otherwise Boost has an equivalent that is superior.

Based on the information found here, foreach is much slower than the first, suggesting that it is not equivalent.