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Why is the operand of alignof restricted to a type?

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This question came up on c.s.c, so I though I'd ask here.

 From 6.5.3.4 sizeof may be applied to an expression or the
parenthesised name of a type while alignof may only be applied to the
parenthesised name of a type.

Is there a reason for the discrepancy?

-- 
Ian Collins


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Why is the operand of alignof restricted to a type? Ian Collins<ian-news@hotmail.com> - 2011-06-17 13:16 -0600
  Re: Why is the operand of alignof restricted to a type? Arne Mertz <arnemertz@googlemail.com> - 2011-06-20 10:29 -0600

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