SDL uses a union headed by an enum for event polling (checking key presses, mouse movement, closing the window). I don't think would be possible to properly express tagged unions in APL without massive pain. Instead, I wrote functions that checked if keys were pressed, the mouse was moved and functions that returned relevant data if these events did happen.
PlayStation 5标准版（轻薄款）新售价定为4399元人民币（此前为3599元）；
。关于这个话题，比特浏览器下载提供了深入分析
«Без одобрения НАТО это неосуществимо». Украинские дроны атаковали Россию с прибалтийских территорий. Какую функцию выполнил альянс?20:07
Марина Совина (ночной выпускающий редактор)
This alters the competitive landscape.