« Return to Thread: [scala] fixed array type
Re: [scala] fixed array type
by Viktor Klang
::
Rate this Message:
But it's fairly easy to wrap the existing array types to create something that might do it for you.
scala> trait FixedArray[T] {
| val length : Int;
| private[this] val array = new Array[T](length)
| def update(a : Int, c : T) = array(a) = c;
| def apply(a : Int) = array(a)
| }
defined trait FixedArray
scala> case class CharArray140 extends FixedArray[Char] { val length = 140 }
defined class CharArray140
scala> CharArray140()
res16: CharArray140 = CharArray140()
scala> res16(0) = 'b'
scala> res16(0)
res18: Char = b
The length of the array is compile-time bounded, but it won't be stack-allocated.
I'm still unsure wether you asked for language builtin support or if the sketchy suggestion above will suffice for your purposes.
--
Viktor Klang
Scala Loudmouth
scala> trait FixedArray[T] {
| val length : Int;
| private[this] val array = new Array[T](length)
| def update(a : Int, c : T) = array(a) = c;
| def apply(a : Int) = array(a)
| }
defined trait FixedArray
scala> case class CharArray140 extends FixedArray[Char] { val length = 140 }
defined class CharArray140
scala> CharArray140()
res16: CharArray140 = CharArray140()
scala> res16(0) = 'b'
scala> res16(0)
res18: Char = b
The length of the array is compile-time bounded, but it won't be stack-allocated.
I'm still unsure wether you asked for language builtin support or if the sketchy suggestion above will suffice for your purposes.
On Wed, Jun 17, 2009 at 12:24 AM, Balthazar Crowley <balthazar.crowley@...> wrote:
Jorge,Thanks for the response. Unfortunately, that expression does not denote a type. And the type of the thing it does denote is not what is required.Regards,Balthazarscala> new Array[Char](140)res20: Array[Char] = Array(, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ...scala>On Tue, Jun 16, 2009 at 2:53 PM, Jorge Ortiz <jorge.ortiz@...> wrote:
new Array[Char](140) ?
--jOn Tue, Jun 16, 2009 at 2:39 PM, Balthazar Crowley <balthazar.crowley@...> wrote:
Viktor,Since this is only for pedagogical purposes, either will do. The example might be familiar to many: Char arrays limited to 140 elements.Regards,BalthazarOn Tue, Jun 16, 2009 at 12:28 PM, Viktor Klang <viktor.klang@...> wrote:
On Tue, Jun 16, 2009 at 9:24 PM, Balthazar Crowley <balthazar.crowley@...> wrote:
All,Does Scala have a fixed array type?
As opposed to broken ones?
Jokes aside, are you talking about stack-allocated fixed arrays or only that they are fixed as in compile-time size bounded?
Regards,Balthazar
--
Balthazar Crowley
Resident Magician
DSLver.com
--
Viktor Klang
Scala Loudmouth
--
Balthazar Crowley
Resident Magician
DSLver.com
--
Balthazar Crowley
Resident Magician
DSLver.com
--
Viktor Klang
Scala Loudmouth
« Return to Thread: [scala] fixed array type
| Free embeddable forum powered by Nabble | Forum Help |
