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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: HELP ! need to insert value in array !!
Date: 1997/07/02
Message-ID: <dewar.867889779@merv>#1/1
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References: <33A9C27C.22F7@post4.tele.dk> <5oci49$97g@crl.crl.com>
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 <dewar.867589873@merv> <33BA7918.41C6@cip.mathematik.uni-stuttgart.de>
Organization: New York University
Newsgroups: 
 comp.lang.c,comp.lang.c++,comp.os.msdos.programmer,comp.lang.asm.x86,comp.lang.ada
Date: 1997-07-02T00:00:00+00:00
List-Id: <comp.lang.ada>


Christian asks

<<Robert Dewar wrote:
>
> suppose that type T is a struct with a double field and an int
> field. The size of this struct would be 12 bytes, but its
> alignment requirement is 8, so it would not be possible to laout
> the array b without alignment gaps???

Why would the alignment requirement be 8 ? On such a system
an implementation would probably pad the struct (which is allowed),
so sizeof(T) would be 16.


Robert replies

The padding has no effect on the alignment requirement, perhaps you
are misunderstanding the term. The alignment of this struct is most
certainly 8, whether or not it is padded.