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Re: What are these functions (warning, push, disable) are in the macro definition?

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On 4/5/2017 10:49 AM, fl wrote:
> Hi,
>
> I have a MSVC project which has the following definitions. It builds
> successfully on MSVC, but I don't understand what warning, push, pop
> and disable are.
>
> Could you tell me that?
>
> Thanks,
>
>
> .........................
> #if DSAS_MSVC
> #define DSAS_MULTILINE_MACRO_END \
>   __pragma( warning( push ) ) \
>   __pragma( warning( disable:4127 ) ) \
>   } \
>   while( 0 ) \
>   __pragma( warning( pop ) )
> #else /* #if DSAS_MSVC  */
> #define DSAS_MULTILINE_MACRO_END \
>   } \
>   while ( 0 )
> #endif

First, all pragma statements (except for those starting with "STDC") are 
implementation-defined, so you would have to check with a Microsoft-related 
group for full details.

However, since I work in MSVC, I recognize it as a basic "temporarily 
disable warning number 4127, and then restore it to whatever state it was 
before".  (That's the "push" and "pop" part.)  Apparently, the actual 
contents of the macro will generate that warning, and the author wants to 
tell the compiler "yes, I know, but it's all good, so shut up about it already".

You can check in a Microsoft-related group, or the MSVC docs for information 
on what, exactly, is warning number 4127.  Or, a quick web search for "msvc 
warning 4127" will answer it as well.

-- 
Kenneth Brody

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What are these functions (warning, push, disable) are in the macro definition? fl <rxjwg98@gmail.com> - 2017-04-05 07:49 -0700
  Re: What are these functions (warning, push, disable) are in the macro definition? scott@slp53.sl.home (Scott Lurndal) - 2017-04-05 15:25 +0000
  Re: What are these functions (warning, push, disable) are in the macro definition? Keith Thompson <kst-u@mib.org> - 2017-04-05 13:46 -0700
  Re: What are these functions (warning, push, disable) are in the macro definition? Ken Brody <kenbrody@spamcop.net> - 2017-04-06 11:38 -0400

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