studio C++-include unistd.h: why not cunistd?




unistd.h download (4)

unistd.h is not part of standard C. Standard C++ lib doesn't include it with the other c headers.

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>?


Answer #1

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.


Answer #2

<unistd.h> , stands for unix standard header ,the name says it all.


Answer #3

Because unistd.h never was part of the C language. It is part of the Operating System.





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