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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...

Parents
  • 0 in reply to Niels Sejersen

    It is probably worth creating some validation code to make sure that things are located in memory in the order you wish.

    The symbol table manager uses a hash algorithm that may be changed in the future, so be careful using tricks like this.

    I'm not saying you shouldn't do this. I'm just saying that you should be careful.

    Jon

Reply
  • 0 in reply to Niels Sejersen

    It is probably worth creating some validation code to make sure that things are located in memory in the order you wish.

    The symbol table manager uses a hash algorithm that may be changed in the future, so be careful using tricks like this.

    I'm not saying you shouldn't do this. I'm just saying that you should be careful.

    Jon

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