On Wed, Nov 05, 2003 at 17:32:43 -0500, Mark Hounschell wrote: > Is it possible to have a function return a 64 bit variable using > > return 64bitvarname I am not sure this is the right list. However: Variable of ANY VALID TYPE can be returned. With special care to arrays (they are used as pointer and thus returned as pointers). That namely includes all primitive types (char, int, float, double) with any modifiers (short, long, long long, signed, unsigned), pointers to any types, enum types, struct types and union types. So yes, you can return 64 bit value. Note however, that returning large things is usualy inefficient, because they are pushed on stack and then poped in the calling function -- that is copied in memory twice. On i386, up to 64 bits should be passed in registers (EDX:EAX pair) and so shouldn't suffer this inefficiency, but I have not checked. Also note, that GCC is known to generate poor code when working with long longs. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
