Allocate N elements

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Is there no way (besides the ugly malloc or any wrappers) to 
allocate _exactly_ N elements at runtime (no static array)?
I tried
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int[] arr = new int[sizeOfItems];
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but if sizeOfItems is e.g. 512, it allocates 1024.
So is there no way to allocate a fixed memory block without the 
usage of C functions?