Re: [Algorithms] How to get 3dvector largest coordinate index?

[Anoop M. <cod...@gm...>]

It might be worth noting that gcc has a "may_alias" type attribute:

http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html

Quoting the docs:

"Accesses through pointers to types with this attribute are not subject to
type-based alias analysis, but are instead assumed to be able to alias any
other type of objects. In the context of 6.5/7 an lvalue expression
dereferencing such a pointer is treated like having a character type. See
-fstrict-aliasing for more information on aliasing issues. This extension
exists to support some vector APIs, in which pointers to one vector type are
permitted to alias pointers to a different vector type."

Mike Acton has written a detailed article on the subject of type aliasing:

http://www.cellperformance.com/mike_acton/2006/06/understanding_strict_aliasing.html

Cheers,
Anoop.

On Wed, Mar 4, 2009 at 8:39 PM, Conor Stokes <
bor...@ya...> wrote:

> Unions are for variants (and trix are for kids!). They can be used to
> implement tagged variant types and even full algebraic data types (if you
> put a union inside of another construct), as well as the lower level uses
> (such as saving storage space, usually through some sort of implicit
> tagging).
>
> Cheers,
> Conor
>
> ------------------------------
> *From:* Jeff Russell <je...@8m...>
> *To:* Game Development Algorithms <gda...@li...
> >
> *Sent:* Thursday, 5 March, 2009 11:33:32 AM
> *Subject:* Re: [Algorithms] How to get 3dvector largest coordinate index?
>
> if cast-through-union violates the standard, then why are unions in the
> language? isn't storing bytes and interpreting them as different types what
> unions are for?
>
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