Matt Fowles wrote:
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.
You may be right, but nevertheless, that's the problem of the
language/pmc implementer (me, in this case). And, if Lua can do it, it
should be possible for me to do it as well.
klaas-jan
