C ++ - include unistd.h：为什么不cunistd？ [英] C++ - include unistd.h: why not cunistd?

问题描述

据说，当在C ++中包含C头文件时，应该删除.h后缀，然后在开头添加c。例如， #include< cstdio> 而不是 #include< stdio.h> 。但是当我在代码中使用 sleep（）时， #include< cunistd> c $ c> #include< unistd.h> 工程。为什么< cunistd> ？

It's said that when including C header files in C++, the ".h" suffix should be removed and then add "c" at the beginning. For example, #include <cstdio> instead of #include <stdio.h>. But when I use sleep() in my code, #include <cunistd> does not work, but #include <unistd.h> works. Why not <cunistd>?

推荐答案

大多数（所有？）标准C头文件，但 unistd.h 不是标准C的一部分，因此标准C ++不包括其他 c ... 头。

Your algorithm is correct for most (all?) standard C headers, but unistd.h is not part of standard C so standard C++ in turn doesn't include it with the other c... headers.

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