I use the convention "size = number of bytes" (as in *size*of), "count = number ...

clarry · on Feb 13, 2015

In the BSDs (and some other code bases) the macro is spelled nitems and is common enough to be considered idiomatic.

tobik · on Feb 13, 2015

Thank you. I did not know about this, I've been using the long version. nitems is defined in sys/param.h in OpenBSD and FreeBSD in case anyone is interested.

__david__ · on Feb 13, 2015

I always call my version lengthof() to match sizeof.

alnsn · on Feb 15, 2015

I use lengthof for lengths of string literals.

kayamon · on Feb 13, 2015

I always call mine "countof" to match the "sizeof" naming convention.

noselasd · on Feb 13, 2015

https://msdn.microsoft.com/en-us/library/ms175773.aspx - although I'm not sure it's a macro. The nice thing is it's detecting that you actually give it an array.