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CHAPTER 5 I OBJECT-ORIENTED PROGRAMMING
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and top. Note how the x parameter, given before the function name swap, is used within the function definition to get access to the record s other members, its fields: #light type Point = { mutable top : int ; mutable left : int } with member x.Swap() = let temp = x.top x.top <- x.left x.left <- temp end let printAnyNewline x = print_any x print_newline() let main() = printAnyNewline myPoint myPoint.Swap() printAnyNewline myPoint main() The results of this example, when compiled and executed, are as follows: {top = 3; left = 7;} {top = 7; left = 3;} You may have noticed the x parameter in the definition of the function Swap: member x.Swap() = let temp = x.top x.top <- x.left x.left <- temp This is the parameter that represents the object on which the function is being called. When a function is called on a value, as follows: myPoint.Swap() the value it is being called on is passed to the function as an argument. This is logical, when you think about it, because the function needs to be able to access the fields and methods of the value on which it is being called. Some OO languages use a specific keyword for this, such as this or Me, but F# lets you choose the name of this parameter by specifying a name for it after the keyword member, in this case x.
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CHAPTER 5 I OBJECT-ORIENTED PROGRAMMING
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Union types can have member functions too. You define them in the same way as for record types. The next example shows a union type, DrinkAmount, that has a function added to it: #light type DrinkAmount = | Coffee of int | Tea of int | Water of int with override x.ToString() = match x with | Coffee x -> Printf.sprintf "Coffee: %i" x | Tea x -> Printf.sprintf "Tea: %i" x | Water x -> Printf.sprintf "Water: %i" x end let t = Tea 2 print_endline (t.ToString()) The results of this example, when compiled and executed, are as follows: Tea: 2 Note how this uses the keyword override in place of the keyword member. This has the effect of replacing, or overriding, an existing function of the type. This is not that common a practice with function members associated with F# types because only four methods are available to be overridden (ToString, Equals, GetHashCode, and Finalize) that are inherited from System.Object by every .NET type. Because of the way some of these methods interact with the CLR, the only one I recommend overriding is ToString. Only four methods are available for overriding because record and union types can t act as base or derived classes, so you cannot inherit methods to override (except from System.Object).
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Object expressions are at the heart of succinct object-oriented programming in F#. They provide a concise syntax to create an object that inherits from an existing type. This is useful if you want to provide a short implementation of an abstract class or an interface or want to tweak an existing class definition. An object expression allows you to provide an implementation of a class or interface while at the same time creating a new instance of it. The syntax is similar to the alterative syntax for creating new instances of record types, with a few small alterations. You surround the definition of an object expression with braces. At the beginning is the name of the class or interfaces, and the name of a class must be followed by a pair of parentheses that can have any values passed to the constructor between them. Interface names need nothing after them, though both class names and interface names can have a type parameter following them, which must be surrounded by angled brackets. This is followed by the keyword with and the definition of the methods of the class or
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