The problem here is that UTCDateTime is defined with #pragma pack 2 in
effect. That means the compiler packs with an alignment of 2, so the
whole structure has 8 bytes. The proper alignment (4) results in 12
bytes. Since there's nothing in the @encode'd information specifying
the non-standard alignment, NSGetSizeAndAlignment (which NSValue
probably uses internally) will return 12 bytes as the struct's size.
As an example,
#include <Foundation/Foundation.h>
void main()
{
NSUInteger size, align;
NSGetSizeAndAlignment (@encode(UTCDateTime),
&size,
&align);
printf("%i, %i, %s\n", sizeof(UTCDateTime), size,
@encode(UTCDateTime));
}
prints "8, 12, {UTCDateTime=SIS}".
HTH,
Johannes Fortmann
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