Uri Guttman <[EMAIL PROTECTED]> writes: > >> Is this then the same datatype as a Perl6 pair (cf '=>' op in Apo 3) ?? > > DS> Good point. it probably is, yes. (Though there may be potential > DS> differences--depends on whether the scheme pair can only have scalars > DS> on each side, or should allow other things)
> that can be handled by the compiler to some degree. and from my lisp > knowledge, a dotted pair can contain anything in each node. so i expect > scheme pairs to map nicely onto perl6 pairs. Correct, especially a list is nothing but a pair with another pair or an end-of-list-marker in its second element. To implement set-car! and set-cdr! both elements of this pair must be mutable > this implies that pairs > should be supported directly in parrot since you can do many > optimizations knowing the array has only 2 elements. maybe even support > some car/cdr depth variations? i don't see any perl use of cddar but who > knows? Sure. One optimization that comes to my mind, is make the PMC big enough to hold 2 PMC-pointers. (actualy it is, if you abuse the data-pointer of which I don't know what its good for). My actual patch uses the same way PerlArray does with KEY* and KEYPAIR* and the needed indirections. bye Jürgen
