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Message: [QUOTE="Eric Sosman, post: 2476711"] Frederick Gotham wrote On 07/28/06 12:56,: `*p+ = p' exhibits undefined behavior that the two-line rewrite does not. 6.5, paragraph 2: "[...] Furthermore, the prior value shall be read only to determine the value to be stored." In `*p++ = p' there are two reads of p's value: the permitted read on the l.h.s. as part of the ++, and another on the r.h.s. (Some may think there's a third read to determine the value that * dereferences, but not so: that value is not the value of p, but the value of the subexpression p++.) To put it another way: Why in the two-line rewrite did you choose to put the assignment first and the increment second? You could just as well have written ++p; *p = p; or (abusing C's syntax to emphasize the U.B.) ++... *p = p; ...p; [/QUOTE]