函数指针 Vs std::function，一个追求零开销，一个拥抱灵活性。 前者是 C 的遗产，后者是 C++ 的契约。 选错一个，轻则多花几毫秒，重则触发堆分配，拖垮整个低延迟系统。 接下来我就详细的给你好好拆解一下，它们的区别到底在哪里。 一、一句话说清本质区别 函数指针：C ...

Function (Fn) keys – F1, F2, F3, etc., come in handy for those who are in dire need of shortcuts on their keyboards. Laptops are usually equipped with such keys but desktop keyboards, especially the ...