Re: [avr-gcc-list] Strings: escape sequence to insert arbitrary hex value ?

[Daniel O'Connor]

On Thursday 05 February 2009 17:22:49 Vincent Trouilliez wrote:
> On Thu, 5 Feb 2009 16:28:55 +1030
>
> "Daniel O'Connor" <address@hidden> wrote:
> > I had a go at getting that to work with preprocessor magic but I don't
> > think it's possible (I'm no CPP guru though).
> >
> > Actually, how about..
> >
> > #define FOO "\070"
> > #define getOrd(x) (x)[0]
>
> Oh, works impeccably, thanks Daniel ! :-)

Glad to help.

> As a newbee, so far I have never ventured into using #defines for
> anything else than plain constants, but looks like making "functions"
> is not that difficult it appears in your example, yet incredibly
> useful/practical ! :o)

Yes.. There are plenty of caveats (check the C FAQ for examples) but they are 
very useful for collapsing repeated code that won't go well into a function 
because it needs local context.

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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