Is this ternary conditional ?: correct (Objective) C syntax?

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From http://en.wikipedia.org/wiki/%3F%3A

A GNU extension to C allows omitting the second operand, and using implicitly the first operand as the second also:

a = x ? : y;

The expression is equivalent to

a = x ? x : y;

except that if x is an expression, it is evaluated only once. The difference is significant if evaluating the expression has side effects.

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