On Monday, 24 March 2014 at 09:09:30 UTC, monarch_dodra wrote:
//----
for (size_t i, j ; someCondition() ; ++i, ++j )
{...}
//----

I think this is *the* single most common use of operator comma, and I also think it is perfectly legit. Sure, it can easily be migrated away from, but I think it would be gratuitous breakage of good code.

Legit but largely useless.
In every cases I've seen where this idiom appears, you can derive j from i and the compiler is able to generate the very same code.

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