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Using Common Object Interface Types from the .NET Libraries
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Like other constructs discussed in this chapter, object interface types are often encountered when using .NET libraries. Some object interface types such as IEnumerable<'a> (called seq<'a> in
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CH A PT ER 6 WO RKI NG WI TH O BJEC TS AN D M OD ULES
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F# coding) are also used throughout F# programming. It is a .NET convention to prefix the name of all object interface types with I. However, using object interface types is very common in F# OO programming, so this convention is not always followed. Here s the essence of the definition of the System.Collections.Generic.IEnumerable<'a> type and the related type IEnumerator using F# notation: type IEnumerator<'a> = abstract Current : 'a abstract MoveNext : unit -> bool type IEnumerable<'a> = abstract GetEnumerator : unit -> IEnumerator<'a> The IEnumerable<'a> type is implemented by most concrete collection types. It can also be implemented by an object expression or by calling a library function such as Seq.unfold, which in turn uses an object expression as part of its implementation.
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Note The IEnumerator<'a> and IEnumerable<'a> interfaces are defined in a library component that
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is implemented using another .NET language. In this section, we have used the corresponding F# syntax. In reality, IEnumerator<'a> also inherits from the nongeneric interface System.Collections.IEnumerator and the type System.IDisposable, and IEnumerable<'a> also inherits from the nongeneric interface System.Collections.IEnumerable. For clarity we ve ignored this here. See the F# library code for full example implementations of these types.
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Some other useful predefined F# and .NET object interface types are as follows: System.IDisposable: Represents values that may own explicitly reclaimable resources. System.IComparable and System.IComparable<'a>: Represent values that can be compared to other values. F# generic comparison is implemented via these types, as you ll see in 8. Microsoft.FSharp.Control.IEvent: Represents mutable ports into which you can plug event listeners, or callbacks. This technique is described in 8. Some other entity is typically responsible for raising the event and thus calling all the listener callbacks. In F#, .NET events become values of this type or the related type Microsoft.FSharp.Control. IDelegateEvent, and the module Microsoft.FSharp.Control.IEvent contains many useful combinators for manipulating these values. This module can be opened simply by using open IEvent.
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Understanding Hierarchies of Object Interface Types
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Object interface types can be arranged in hierarchies using interface inheritance. This gives a way to classify types. To create a hierarchy, you simply use the inherit keyword in an object interface type definition along with each parent object interface type. For example, the .NET Framework includes a hierarchical classification of collection types: ICollection<'a> extends
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CHAPTER 6 WORKING WITH OBJECTS AND MODULES
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IEnumerable<'a>. Here are the essential definitions of these types in F# syntax, with some minor details omitted: type IEnumerable<'a> = abstract GetEnumerator : unit -> IEnumerator<'a> type ICollection<'a> = inherit IEnumerable<'a> abstract Count : int abstract IsReadOnly : bool abstract Add : 'a -> unit abstract Clear : unit -> unit abstract Contains : 'a -> bool abstract CopyTo : 'a[] * int -> unit abstract Remove : 'a -> unit When you implement an interface that inherits from another interface, you must effectively implement both interfaces.
Caution Although hierarchical modeling is useful, it must also be used with care, because poorly designed
hierarchies often have to be abandoned late in the software development life cycle, leading to major disruptions. For many applications it is adequate to use existing classification hierarchies in conjunction with new nonhierarchical interface types.
More Techniques to Implement Objects
Objects can be difficult to implement from scratch; for example, a graphical user interface (GUI) component must respond to many different events, often in regular and predictable ways, and it would be tedious to have to recode all this behavior for each component. This makes it essential to support the process of creating partial implementations of objects, where the partial implementations can then be completed or customized. In the following sections, we cover techniques to build partial implementations of objects.
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