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F# Decorator Pattern

Decorator Pattern

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// Decorator Pattern
[<AbstractClassAttribute>]
type ComputerParts() =
    abstract member Description :unit -> unit

type Computer() =
    inherit ComputerParts()
    override O.Description() = printf "I'm a Computer with"

type CDROM( c :ComputerParts ) =
    inherit ComputerParts()
    override O.Description() = c.Description(); printf ", CDROM"

type Mouse( c :ComputerParts ) =
    inherit ComputerParts()
    override O.Description() = c.Description(); printf ", Mouse"

type Keyboard( c :ComputerParts ) =
    inherit ComputerParts()
    override O.Description() = c.Description(); printf ", Keyboard"

let mutable computer = Computer() :> ComputerParts
computer <- Mouse( computer )
computer <- CDROM( computer )
computer <- Keyboard( computer )

computer.Description()
Multiple items
type AbstractClassAttribute =
  inherit Attribute
  new : unit -> AbstractClassAttribute

Full name: Microsoft.FSharp.Core.AbstractClassAttribute

--------------------
new : unit -> AbstractClassAttribute
Multiple items
type ComputerParts =
  new : unit -> ComputerParts
  abstract member Description : unit -> unit

Full name: Script.ComputerParts

--------------------
new : unit -> ComputerParts
abstract member ComputerParts.Description : unit -> unit

Full name: Script.ComputerParts.Description
type unit = Unit

Full name: Microsoft.FSharp.Core.unit
Multiple items
type Computer =
  inherit ComputerParts
  new : unit -> Computer
  override Description : unit -> unit

Full name: Script.Computer

--------------------
new : unit -> Computer
val O : Computer
override Computer.Description : unit -> unit

Full name: Script.Computer.Description
val printf : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printf
Multiple items
type CDROM =
  inherit ComputerParts
  new : c:ComputerParts -> CDROM
  override Description : unit -> unit

Full name: Script.CDROM

--------------------
new : c:ComputerParts -> CDROM
val c : ComputerParts
val O : CDROM
override CDROM.Description : unit -> unit

Full name: Script.CDROM.Description
abstract member ComputerParts.Description : unit -> unit
Multiple items
type Mouse =
  inherit ComputerParts
  new : c:ComputerParts -> Mouse
  override Description : unit -> unit

Full name: Script.Mouse

--------------------
new : c:ComputerParts -> Mouse
val O : Mouse
override Mouse.Description : unit -> unit

Full name: Script.Mouse.Description
Multiple items
type Keyboard =
  inherit ComputerParts
  new : c:ComputerParts -> Keyboard
  override Description : unit -> unit

Full name: Script.Keyboard

--------------------
new : c:ComputerParts -> Keyboard
val O : Keyboard
override Keyboard.Description : unit -> unit

Full name: Script.Keyboard.Description
val mutable computer : ComputerParts

Full name: Script.computer
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More information

Link:http://fssnip.net/k5
Posted:4 years ago
Author:Evanescent Devil
Tags: design patterns , decorator pattern