https://visualstudio.microsoft.com/pure-virtual-cpp-event/
origin - https://www.pipiscrew.com/?p=18190 pure-virtual-c-event-on-30-april
https://visualstudio.microsoft.com/pure-virtual-cpp-event/
origin - https://www.pipiscrew.com/?p=18190 pure-virtual-c-event-on-30-april