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Complying with standard C

Expressions

Most expression operators require (complete) object types. The only three exceptions are the unary & operator, the first operand of the comma operator, and the second and third operands of the ?: operator. Most operators that accept pointer operands also permit pointers to incomplete types, unless pointer arithmetic is required. The list includes the unary * operator, even though some may find this surprising. For example, given:

   void *p
&*p is a valid subexpression that makes use of this.
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