[Haskell-cafe] Re: Mutable but boxed arrays?
Ketil Malde wrote: On Wed, 2007-09-05 at 20:37 +0200, Henning Thielemann wrote: Can someone explain me, why there are arrays with mutable but boxed elements? I, on the other hand, have always wondered why the strict arrays are called unboxed, rather than, well, strict? Strictness seems to be their observable property, while unboxing is just an (admittedly important) implementation optimization. I imagine that it'd be at least as easy to implement the strictness as the unboxedness for non-GHC compilers, and thus increase compatibility. You're quite right, that was a mistake, we should have called them strict arrays. Hugs implements the unboxed arrays without any kind of unboxing, I believe. Cheers, Simon ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: Mutable but boxed arrays?
On 9/6/07, Simon Marlow [EMAIL PROTECTED] wrote: Ketil Malde wrote: I, on the other hand, have always wondered why the strict arrays are called unboxed, rather than, well, strict? Strictness seems to be their observable property, while unboxing is just an (admittedly important) implementation optimization. I imagine that it'd be at least as easy to implement the strictness as the unboxedness for non-GHC compilers, and thus increase compatibility. You're quite right, that was a mistake, we should have called them strict arrays. Hugs implements the unboxed arrays without any kind of unboxing, I believe. Any chance of a Data.Array.Strict and deprecating Data.Array.Unboxed? Cheers, /Josef ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: Mutable but boxed arrays?
Henning Thielemann wrote: I'll see, if I understand it. do writeArray arr 0 2 x - readArray arr 0 writeArray arr 0 (x+x) If 'arr' is an STArray, the 'arr' will contain the unevaluated expression 2+2 as zeroth element and with type STUArray it will contain the evaluated 4 ? Exactly. Put differently, writeArray :: STUArray - .. is strict in the third argument whereas writeArray :: STArray - .. is not. Regards, apfelmus ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
