Re: Type-punning

[Silvius Rus <rus at google dot com>]

Herman Geza wrote:
> aliasing  when GCC (I think) incorrectly treats types different, but 
> they're the same.  For example, I have:
>
> struct Point {
> 	float x, y, z;
> };
>
> struct Vector {
> 	float x, y, z;
>
> 	Point &asPoint() {
> 		return reinterpret_cast<Point&>(*this);
> 	}
> };
>
> Point and Vector have the same layout, but GCC treats them different when 
> it does aliasing analysis.  I have problems when I use Vector::asPoint.  
>   
I also think this case should not be flagged.  I have seen similar usage 
in network programming.  Did it actually result in bad code or was it 
just the warning that bothered you?

> :)  Thanks for your responses.
>   
You're welcome.
Silvius