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Message: [QUOTE="Mikhail Teterin, post: 2398228"] No, it is not. Your analogy is flawed for two reasons: 1. Both of the different data pointers in my question are pointers to structures (gzFile, known externally as void, and FILE), although different structures. Such pointers are interchangable. 2. I'm not trying to assign any values to the memory being pointed to by these either (no dereferencing) -- just passing them down to functions (gzgetc, fgetc), which know how to deal with them. There is also another pair of pointers in my example -- pointers to functions (gzgetc and fgetc). This confusion may have led you to the flawed analogy, but, unlike pointers to _different_ data-types, pointers to functions are interchangable too. -mi [/QUOTE]