Klaas-Jan~ On 1/20/06, Klaas-Jan Stol <[EMAIL PROTECTED]> wrote: > Hi, > > I tried to index aggregates using several types of keys (that is, > several types of values), and it seems only string and integer values > can be used as keys. A quick look at the source in > compilers/imcc/symreg.c confirms this, there is no case for 'N' values > (and a test makes Parrot say build_key: unknown set). > > Will it be possible to use floating points as keys for arrays? It's up > to the PMC to implement the indexing correctly, so support for this by > IMCC should be no problem, I think. > > (I vaguely remember myself asking this sort of question before, quite > some time ago, but I couldn't find it anywhere in the mail archives -- > sorry about that) > > The reason for this question is LuaTable PMC, which can be used as both > an array as well as a Hashtable. I'd like to implement proper Lua Table > behaviour into the LuaTable PMC, but it should be able to cope with code > like this: > > $P0 = new .LuaTable > $P1 = new .LuaNumber > $P1 = 42 > $P0[1.234] = $P1 > > And this currently doesn't work, as mentioned above. (According to the > PDD on keys, it should be possible to do this: > > op arg, P1[12.34] # Constant number key - handled as constant key
I am not sure how wise an idea this is given the difficult of comparing floating point numbers for equality. Matt -- "Computer Science is merely the post-Turing Decline of Formal Systems Theory." -Stan Kelly-Bootle, The Devil's DP Dictionary
