Hi René, On Sat, 28 Jan 2017, René Scharfe wrote: > Add a macro for exchanging the values of variables. It allows users to > avoid repetition and takes care of the temporary variable for them. It > also makes sure that the storage sizes of its two parameters are the > same. Its memcpy(1) calls are optimized away by current compilers. How certain are we that "current compilers" optimize that away? And about which "current compilers" are we talking? GCC? GCC 6? Clang? Clang 3? Clang 3.8.*? Visual C 2005+? Ciao, Dscho