Op Do. 9 Mei 2019 om 15:45 het Coda Highland <chighland@gmail.com> geskryf:
> But the #n == 8 comment was never meant as anything more than a flippant remark.
My original motivation (not divulged in the post) was that invoking a
function to get the absolute value of a number is really a very
cumbersome way for something that can be done by the C ternary
operator.Therefore I looked around for a unary operator not yet
defined for type "number" and found that __len is the only candidate.
It's a ten-line patch to lvm.c:
534a535,544
> case LUA_TNUMINT: {
> lua_Integer n=ivalue(rb);
> setivalue(ra,n<0?-n:n);
> return;
> }
> case LUA_TNUMFLT: {
> lua_Number x=fltvalue(rb);
> setfltvalue(ra,x<0?-x:x);
> return;
> }
Then I suppose it is both amusing and appropriate that I came up with #n = abs(n) as well. :P
Not sure I think it's all that clumsy to use a function, though.
/s/ Adam
