Is there a way to make this macro work for Palm? Is there a data type
equivalent to size_t in Palm? Would a cast to a Byte type work?
TIA
Luca
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: Palm Developer Forum <[EMAIL PROTECTED]>
Sent: Thursday, February 10, 2000 4:47 PM
Subject: Re: calculating an offset
>
>
> "size_t" is not a Palm data type. It's a Standard C Library data type.
It's
> usually equivalent to a signed or unsigned int or long int.
>
> The idea behind "offsetof" is to determine the distance from the start of
a
> structure to a particular field in the structure, the result being
expressed in
> bytes.
>
> The way it works is to make the compiler think there's an instance of this
> structure at memory location zero, and then to take the address of the
field
> that you're interested in. With the structure at memory location zero, the
> field's location and offset are the same value.
>
> -- Keith Rollin
> -- Palm OS Emulator engineer
>
>
>
>
>
> "Luca" <[EMAIL PROTECTED]> on 02/10/2000 01:43:28 PM
>
> Please respond to "Palm Developer Forum" <[EMAIL PROTECTED]>
>
> Sent by: "Luca" <[EMAIL PROTECTED]>
>
>
> To: "Palm Developer Forum" <[EMAIL PROTECTED]>
> cc: (Keith Rollin/HQ/3Com)
> Subject: calculating an offset
>
>
>
>
> I'm trying to find a way to calculate the offset to a field in a
structure.
> I searched the Knowledge Base and found a macro that could be handy
>
> #define offsetof(type, member) ((size_t) &(((type *) 0)->member))
>
> type: Structure type
> member: particular member of the structure
> size_t: ??
>
> I can't figure out what size_t is supposed to be (I'm new to Palm
> programming. Actually, I'm fairly new to programming in general!). Any
> help would be greatly appreciated. Further, if you have the patience an
> explanation of the logic behind the operation would be nice.
>
> Thanks in advance
> Luca
>
>
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