Class Instance allocations

[Justin Johansson]

Robert Jacques wrote:
> On Wed, 13 Jan 2010 10:29:35 -0500, Justin Johansson <no at spam.com> wrote:
> 
>> I understand your quandary.
>>
>> For me "Win32" == "32 bits" == "4 bytes" == "sizeof(ubiquitous machine 
>> register)".
>>
>> So why on earth, since Visual Studio 2001 (and before?), was the 
>> default alignment set to 8 bytes for the M$ C/C++ compiler code 
>> generation option?  This I just do not understand (so, of course, 
>> enlightenment is welcome).
>>
>> Beers for the New Years,
>>
>> Justin Johansson
> 
> If I recall correctly, doubles require 8-byte alignment. So you object 
> therefore must require 8-byte alignment.

Instances of my Foo class require 17 bytes so therefore all objects 
require 17 byte alignment.  But for my Bar class it's 42.

???