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Message: [QUOTE="?? Tiib, post: 5086433"] That is why I snipped it as irrelevant. On cases of unspecified behaviors (something may or may not happen) standard tends to tell the limits of allowable behaviors. (not so on case of undefined behaviors). That is cite of ?1.9/3? Mine copy has such: "Certain other aspects and operations of the abstract machine are described in this International Standard as unspecified (for example, order of evaluation of arguments to a function). Where possible, this International Standard defines a set of allowable behaviors. These define the nondeterministic aspects of the abstract machine. An instance of the abstract machine can thus have more than one possible execution for a given program and a given input." What set of allowable behaviors for what unspecified behavior you are talking about? What paragraph? [/QUOTE]