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Re: Structs versus Vectors

Subject: Re: Structs versus Vectors
From: Richard Somers <email@hidden>
Date: Mon, 12 May 2008 08:11:11 -0600
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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."

However I can not find a statement like this in K&R C or the C99 standard. Perhaps I am not looking in the right place or it is worded differently in the standard. Does any one know where this is located in standard?

Best Regards,
Richard

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

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