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Comment by BudVVeezer | Hacker News Reader

One of the two values (a or b) gets evaluated twice. Eg)

  min(a++, b++);

a or b would really be incremented twice.

Nice thanks. Makes perfect sense and I can see that making for a hair pulling debug session if you weren't aware of it.

It's the kind of thing that's made me very familiar with the -E option for GCC, which makes it spit out the preprocessed code...