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F#classes
f#

I have a problem :

I wrote:

open System

open System.IO

type Parser(fileName:string) =

let name=fileName

let reader=File.OpenText(name)

let mutable command=null

member this.advance () =

begin

let endOfFile = reader.EndOfStream

if (endOfFile<>true)then

let commandLine = reader.ReadLine()

let split=[|' '|]

command <- commandLine.Split(split,StringSplitOptions.RemoveEmptyEntries)

end

member this.commandType() =

begin

command[0]

end

member this.arg1()=

begin

command[1]

end

member this.arg2()=

begin

command[2]

end

I initialize 'command' with null

but then it became an array with the function this.advance()

and I want to reffer 'command' like an array in the functions arg1,arg2,commandType...

but I have an error - in line- command[0] he wrote me "this value is not a funtion and cannot be applied..

so what wrong?

.

In F#, indexers are accessed via ".[ ]". So you need to write "command.[0]", then it should be fine.

By on 11/4/2009 5:47 AM ()

Oh and the reason you got that particular error is because the way you had it "command[0]" is passing the list [0] to command, which is not a function. For example:

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> let command x = printfn "It's %A" x;;

val command : 'a -> unit

> command[0];;
It's [0]
val it : unit = ()
By on 11/4/2009 5:49 AM ()

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