Re: Alignment in structs
Re: Alignment in structs
- Subject: Re: Alignment in structs
- From: Eric Albert <email@hidden>
- Date: Fri, 14 Jul 2006 16:51:39 -0700
On Jul 14, 2006, at 4:41 PM, Laurence Harris wrote:
On Jul 14, 2006, at 6:57 PM, Eric Albert wrote:
On Jul 14, 2006, at 3:49 PM, Laurence Harris wrote:
What do I need to set in Xcode to get the size of this struct:
typedef struct Blah {
UInt32 a, b, c;
SInt16 d;
} Blah;
to be 14 instead of the 16 I'm getting currently? Thanks,
#pragma pack(2)
typedef struct Blah {
UInt32 a, b, c;
SInt16 d;
} Blah;
#pragma pack()
Hope this helps,
Thanks. Now, would I see padding issues with this as well:
typedef struct Blah {
SInt16 d;
UInt32 a, b, c;
} Blah;
Depends on what you mean by padding issues. On a 32-bit system using
normal 4-byte alignment, d will be at offset 0, followed by two bytes
of padding, followed by a, b, and c. #pragma pack(2) will pack them
all together, so a will be at offset 2, b at offset 6, and c at
offset 10.
-Eric
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