From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 21 Aug 2012 22:51:34 +0000 (-0700)
Subject: Add helper 'for_each_dive()' dive iterator
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=666538ec7739fe839623bd1b6f9f80ff884ad5a9;hp=666538ec7739fe839623bd1b6f9f80ff884ad5a9;p=ext%2Fsubsurface.git

Add helper 'for_each_dive()' dive iterator

It's an easy thing to do, but the for-loop ends up being pretty ugly, so
hide it behind the macro.

It would be even prettier with one of the (few) useful C99 features:
local for-loop variables.  However, gcc needs special command line
options, and other compilers may not do it at all. So instead of doing

   #define for_each_dive(_x) \
      for (int _i = 0; ((_x) = get_dive(_i)) != NULL; _i++)

we require that the user declare the index iterator too, and the use
syntax becomes

   for_each_dive(idx, dive) {
	... use idx/dive here ...
   }

And hey, maybe somebody actually will want to use the index, so maybe
that's not all bad.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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