Re: struct size?
Re: struct size?
- Subject: Re: struct size?
- From: philippe wicker <email@hidden>
- Date: Sat, 11 Mar 2006 20:32:46 +0100
On Mar 11, 2006, at 7:50 PM, Erick Tejkowski wrote:
Can anyone help me figure out why SizeOf reports that the size of a
ScheduledAudioFileRegion struct is 96 bytes, but when I add the
numbers up in my head, it comes to 92? I've appended sizes to each
struct member below to show you how I came up with 92. Any ideas
what I am calculating wrong?
You're simply not calculating the same way as the C++ compiler
does :) Your struct contains 8 bytes length fields (mStartFrame and
some other fields within AudioTimeStamp) so it has an alignment
constraint of 8. 92 is not evenly divisible by 8, 96 is. So the
compiler allocates a size of 96 bytes to your struct. There exist
some pragmas that tells the compiler to use different alignment
constraints but I don't remember what they are.
Thanks, Erick
struct ScheduledAudioFileRegion {
AudioTimeStamp mTimeStamp;//64
ScheduledAudioFileRegionCompletionProc mCompletionProc; // 4
void * mCompletionProcUserData;//4
struct OpaqueAudioFileID *mAudioFile; //4
UInt32 mLoopCount; //4
SInt64 mStartFrame; //8
UInt32 mFramesToPlay; //4
};
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| References: | |
| | >struct size? (From: Erick Tejkowski <email@hidden>) |