01-06-2009
The actual difference is that the first example copies the address of your pmem pointer to the stack and the second example doesn't. The second example only works because you're using malloc() which allocates memory from the heap, otherwise you could have unexpected behavior because you would be returning a local variable (which is cleared upon function completion).
IMHO the second option would be faster because there's one less parameter to be copied to the stack and there's no desreferencing of the pointer's address to obtain the data. Anyway, you should feel no significant speed difference in any of the alternatives.
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