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Re: Structs versus Vectors


On 2008/05/12, at 16:11, Richard Somers wrote:


On May 8, 2008, at 12:35PM, Wesley Smith wrote:

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


You can always do:

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


I found the following quote on the web which I think relates to this.

http://www.red-bean.com/guile/guile/new/msg02536.html

"ANSI C guarantees that it is safe to cast a pointer to a structure to a pointer to the type of that structure's first element."

First element. But then, nothing guarantee that the second element will follow the first without padding.


--
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: Richard Somers <email@hidden>)



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