structs, templates, alias

[Ellery Newcomer]

On 04/25/2010 02:10 PM, Robert Clipsham wrote:
> On 25/04/10 19:15, Ellery Newcomer wrote:
>> Yeah, that's about what I do. The trouble is getting blit to know which
>> field is the length field. I suppose you could pass an index into the
>> tuple to the substructure. That still wouldn't fix the substructure
>> being able to modify the field length.
>
> I don't know how the input data is formatted, but an array is always in
> the form:
> ----
> struct
> {
> size_t length;
> void* ptr;
> }
> ----
> So it shouldn't be a problem knowing what offset to write the
> length/elements at.

Hmm. Either I'm not understanding you or I didn't explain something clearly.

something like this

struct Rec2{
   ushort index;
   ushort nparams;
   ushort options;
   ushort[] params; // this has nparams elements
}

Rec2 rec2 = {index:1, nparams:2, options:~0, params:[4,5]};

would translate to something like

x"01 00 02 00 FF FF 04 00 05 00"

only the elements part of params gets written out, the length part doesn't.