Evaluation of an expression may produce side effects. At specific points during execution called sequence points, all side effects of previous evaluations have completed and no side effects of subsequent evaluations have yet taken place.
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According |
to section 6.5 of \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] (see also [undefined behavior 32 | CC. Undefined Behavior#ub_32] of Annex J): |
Between the previous and next sequence point an object can only have its stored value modified once by the evaluation of an expression. Additionally, the prior value can be read only to determine the value to be stored.
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