Re: OSS sound

The do/while swallows the the ';'.

If you have it like you wrote, this would fail:

if (foo)
  CLEAR_OMR(omr);
else
  something_else();

because there will be two statements after the if.

In the case of the do/while, the ';' gets swallowed up.. so that above
case would work, making the macro call seem more natural.

See:
http://developer.apple.com/documentation/DeveloperTools/gcc-3.3/cpp/Swallowing-the-Semicolon.html#Swallowing%20the%20Semicolon
for more info.

Cheers,
David

> Yes, I understand how macros work. My question is why have a do/while loop that
> will always exit at the first test? Why not write the macros as:
> 
> ...
> #define CLEAR_OMR(omr) { int x = 0; read((omr)->msg_pipe[0], &x, sizeof(x)); }
> #define RESET_OMR(omr) { } 
> ...
> 
> It just seems like a strange thing to do.
> 
> rob

-- 
David Hammerton
TransGaming Technologies
[email protected]
http://www.transgaming.com/
*Let the games begin*



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