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https://bravikov.wordpress.com/2017/08/29/%d0%bf%d1%80%d0%b0%d0%b2%d0%b8%d0%bb%d0%b0-%d0%ba%d0%be%d0%b4%d0%b8%d1%80%d0%be%d0%b2%d0%b0%d0%bd%d0%b8%d1%8f-%d0%b2-qt/
Правила кодирования в Qt