Hi
@1 refers to the first parameter of the mx macro call, @2 to the second and
so on.
For example if
@=macro_mx
printf("@1 @2 @3\n");
and you call macro_mx like that:
@:macro_mx(one, two, three):@
it will print
one two three
On Fri, Dec 30, 2011 at 3:26 AM, David Pennell <dpenn...@good-cloud.com>wrote:
> Where can I learn more about mx files?
>
> In particular, in the following code, it looks like @2 is derived from the
> type expands this into a multitude of type specific functions. I can't
> figure out what @3 is. Is there a list of these?
>
> SORTfndlast_@2(BAT *b, ptr v)
> {
> BUN diff, end = BUNlast(b), cur = end;
> BUN lo = BUNfirst(b), hi = end;
> int cmp = 1;
> BATiter bi = bat_iterator(b);
>
> if (lo >= hi || @3_CMP(BUNt@1(bi, cur - 1), v, @4)<=0) {
> /* shortcut: if BAT is empty or last (and hence all) tail
> * value is <= v, we're done. */
> return cur;
> }
> while (lo < hi) {
> BUN mid = (lo + hi) >> 1;
> cur = mid;
> cmp = @3_CMP(BUNt@1(bi, cur), v, @4);
> if (cmp < 0) {
> lo = ++mid;
> cur++;
> } else if (cmp > 0) {
> hi = mid;
> } else {
> break;
> }
> }
> if (cmp == 0 && b->tkey == 0) { /* shift over multiple equals */
> for(diff = (end-cur)>>1; diff; diff >>= 1) {
> while ((cur+diff) < end && @3_EQ(BUNt@1(bi, cur+diff), v, @4)) cur +=
> diff;
> }
> }
> if (cmp == 0) cur++;
> return cur;
> }
>
>
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desktops for less than the cost of PCs and save 60% on VDI infrastructure
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