>>>>> "Al" == Al Davis <ad19@freeelectron.net> writes: Al> Since you didn't say what uint64_t is, let me make a diabolical Al> definition of it. uint64_t is a type defined in C99, which is always a 64-bit unsigned integer. Whether it is already in your C++ compiler depends pretty much on platform, but it can be expected that before too long it will. Regards, Isaac.