Qt algorithms, iterators, and gotchas

There's isn't that much to say about Qt algorithms, as they were deprecated in Qt 5 and it is now recommended to use the algorithms from the STL—also with Qt containers. The Qt algorithms included basic ones like qFind, qCount, qBinaryFind, and so on. However, some of the algorithms are not deprecated, namely the bit algorithms such as qCountLeadingZeroBits, qCountTrailingZeroBits, and qPopulationCount. Additionally, the qDeleteAll algorithm is still supported because there's no direct counterpart for it in the standard library.

Iterators and iterations

The simplest algorithm you can imagine, though, is iterating over a collection. For that purpose, you should use...