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Rationale: * http://stackoverflow.com/questions/154136/do-while-and-if-else-statements-in-c-c-macros/154138#154138 But Visual Studio issues a warning: `warning C4127: conditional expression is constant` * http://stackoverflow.com/questions/1946445/c-c-how-to-use-the-do-while0-construct-without-compiler-warnings-like-c412