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Placing size of array at start of array

Richard Collett

Hi all,
I am working with the TI TUSB3200, trying to modify their example code for our own USB device. USB requires many tables which start with a length byte. I would like to use the sizeof operator to calculate this for me, as shown here:

byte code rictest[] =
{
	sizeof(rictest),
	1,
	2
};
This gives the error 
warning C198: sizeof returns 0
, so plainly the compiler only does a single pass through the code, and does not know the array size until it has finished parsing the entire array definition. :(

Is there any other way to achieve this? I presume it would be possible with some sort of pre-processor macro to count the number of elements manually before defining the aray...

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  • 0

    This is an example of an incomplete type. The C language does not support it so why should a compiler. You can only do this with pointers to incomplete types, but then of course you only get the size of the pointer.

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    This is an example of an incomplete type. The C language does not support it so why should a compiler. You can only do this with pointers to incomplete types, but then of course you only get the size of the pointer.

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