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Re: Structs versus Vectors


On 2008/05/08, at 20:43, Jocelyn Houle wrote:


On 2008-05-08, at 14:35 , Wesley Smith wrote:


Apple defines a point like this.

   typedef struct _NSPoint {
       float x;
       float y;
   } NSPoint;

Apple also repeats this pattern in some of their sample code like this.

   typedef struct {
       GLdouble x,y,z;
   } recVec;


You can always do:

NSPoint p;
glVertex2fv((float *)&p);

revVec v;
glVertex3fv((float *)&v);



You can also use the following forms:
 glVertex2fv( &p.x );
 glVertex3dv( &v.x );


I just want to say that, even if it works under MacOS X, and surely on many systems/compilers, this is not C compliant, as, according to the standard, a structure may be padded.

Regards

--
kuon

http://kuon.goyman.com
http://goyman.com

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References: 
 >Structs versus Vectors (From: Richard Somers <email@hidden>)
 >Re: Structs versus Vectors (From: "Wesley Smith" <email@hidden>)
 >Re: Structs versus Vectors (From: Jocelyn Houle <email@hidden>)



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