Re: C++ class member alignment in Xcode
Re: C++ class member alignment in Xcode
- Subject: Re: C++ class member alignment in Xcode
- From: Wyatt Webb <email@hidden>
- Date: Thu, 8 Feb 2007 11:39:04 -0800
It's funny that you should ask this. I just finished chasing down the
very same kind of problem in our project earlier in the week.
There are two #pragmas that can change your struct alignment:
"#pragma options align" or "#pragma pack". These are usually used in
pairs so the packing is changed for known data structures. In our
case, we were using "#pragma options align=..." and forgot to close
it with "#pragma options align=reset" in a header file. Since this
malformed header was included in many places, it had side-effects in
each file that used it.
The compiler never complained, but I had a situation where sizeof
( myClass ) would return different sizes in different .cpp files.
So, I would be looking for #pragmas and making sure they were all
closed properly.
-Wyatt
On Feb 8, 2007, at 11:05 AM, <email@hidden> <email@hidden>
wrote:
Hello,
I am having a problem with a derived class accessing members in the
base
class. It looks like this:
[...]
I have preformed a clean rebuild of the project and get the same
result.
Why does one file use 4-byte alignment while another on in the same
project uses 2-byte?
Regards,
Ron Lingl
Interactive Solutions, Inc.
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