Re: [boost] Geometry/Vector Lib

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-09-22 09:43:32

Won't that not work in the presence of padding? Sorry for the TP, lookout webmail.

-----Original Message-----
From: boost-bounces_at_[hidden] on behalf of Marcus Lindblom
Sent: Fri 9/22/2006 12:17 AM
To: boost_at_[hidden]
Subject: Re: [boost] Geometry/Vector Lib
 
Olivier Grant wrote:
> I agree on your point, on the other hand, you can do this :
>
>    class vector3d
>    {
>    public:
>       float x, y, z;
>
>       float operator[]( int index ) const
>       { return ((float *)this)[index]; }
>
>       float & operator[]( int index )
>       { return ((float *)this)[index]; }
>
>       /* ... */
>    };
>
> in which case "v.x" and "v[0]" are the same thing. this is what I currently
> have. Now some people will argument its a hack maybe.
>   
I've sometimes done just:

   class vector3d
   {
   public:
      float x, y, z;

      float operator[]( int index ) const
      { return (&x)[index]; }

      /* ... */
   };

/Marcus