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What is the meaning of these keywords used before variables in a
function parameters?

__in
__out
__in_opt

rup wrote:
> What is the meaning of these keywords used before variables in a
> function parameters?
>
> __in
> __out
> __in_opt
>

These are Microsoft extensions that annotate the parameters for

__in: input parameter
__out output parameter
__in_opt: optional input parameter

rup wrote:
>
> What is the meaning of these keywords used before variables in a
> function parameters?
>
> __in
> __out
> __in_opt

They are reserved for the implementor. So read your compiler
documentation. We have no idea.

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>


--
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rup wrote:
> What is the meaning of these keywords used before variables in a
> function parameters?
>
> __in
> __out
> __in_opt

Sure there wasn't an __inout there too?

I use my own IN, OUT and INOUT macros, to document flow:

#define IN
#define OUT
#define INOUT

Identifiers with "__" prefix, is reserved by your implementation, i.e.
are *not* keywords in C.

--
Tor <torust [at] online [dot] no>
"I have stopped reading Stephen King novels. Now I just read C code instead"