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Game Programming using Qt 5 Beginner's Guide - Second Edition by Lorenz Haas, Witold Wysota, Pavel Strakhov

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Qt versions

Each Qt version number (for example, 5.9.2) consists of major, minor, and patch components. Qt pays special attention to forwards and backwards compatibility between different versions. Small changes which are both forwards and backwards compatible (typically bug fixes without changing any API) are indicated by changing only the patch version. New minor versions usually bring in new API and features, so they are not forwards compatible. However, all minor versions are backwards binary and source compatible. This means that if you're transitioning to a newer minor version (for example, from 5.8 to 5.9), you should always be able to rebuild your project without changes. You can even transition to a new minor version without rebuilding, ...

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