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CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
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Note You can add accessibility annotations to type abbreviations. However, the abbreviation is still just an
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abbreviation only the name is hidden, not the actual equivalence. That is, if you define a type abbreviation such as type private label = int, then all users of the type label know that it s really just an abbreviation for int and not a distinct type definition of its own. This is because .NET provides no way to hide type abbreviations; the F# compiler expands type abbreviations in the underlying generated .NET IL code.
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Listing 7-5 shows a type where some methods and properties are labeled public but the methods that mutate the underlying collection (Add and the set method associated with the Item property) are labeled internal. Listing 7-5. Making Property Setters Internal to a Type Definition open System.Collections.Generic type public SparseVector () = let elems = new SortedDictionary<int,float>() member internal vec.Add (k,v) = elems.Add(k,v) member public vec.Count = elems.Keys.Count member vec.Item with public get i = if elems.ContainsKey(i) then elems.[i] else 0.0 and internal set i v = elems.[i] <- v
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Note In class types, let bindings in types are private to the object being constructed, and all member bindings
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are public they have the same accessibility as the type definition. This is a useful default because it corresponds to the common situation where internal implementation details are fully private and published constructs are available widely, and because omitting accessibility annotations makes code more readable in the common case. When you start to add more specific accessibility annotations, such as by making individual members internal or private, then it s useful to explicitly mark all members with accessibility annotations. Doing so makes your code more readable because readers don t have to remember that unmarked members are public. You can leave the remaining let bindings unmarked and implicitly private. In short, we recommend that if you mark any members of a type with accessibility annotations, you should mark them all.
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CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
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Using Namespaces and Modules
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An important organizational technique is to give sensible qualified names to your types and values. A qualified name is, for example, Microsoft.FSharp.Collections.List (for the F# list type) or System.IO.StreamReader (for one of the types in the .NET Framework BCL). Qualified names are particularly important when you re writing frameworks to be used by other people and are also a useful way of organizing your own code. You give types and functions qualified names by placing them in namespaces, modules, and type definitions. Table 7-1 shows these three kinds of containers and what they can contain. For completeness, the table includes type abbreviations, which are slightly different because you can t use them as a container for other constructs. Table 7-1. Namespaces, Modules, Types, and What They Can Contain
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Entity
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Namespace
Description
A namespace can contain further namespaces, modules, and types. Multiple DLLs can contribute to the same namespace. A module can contain nested modules, types, and values. A type definition can contain members and nested type definitions. A type abbreviation such as string, for System.String, can t act as containers for additional members, values, or types.
Examples
System, Microsoft.FSharp
Module
Microsoft.FSharp.Collections.Map, Microsoft.FSharp.Collections.List System.String, System.Int32
Concrete type definition Type abbreviation
int, string
Putting Your Code in a Namespace
You saw in 6 how to define type definitions with members and modules with values. Now, you look at how to place these in namespaces. Listing 7-6 shows a file that contains two type definitions, both located in the namespace Acme.Widgets. Listing 7-6. A File Containing Two Type Definitions in a Namespace namespace Acme.Widgets type Wheel type Widget = Square | Round | Triangle = { id: int; wheels: Wheel list; size: string }
Namespaces are open, which means multiple source files and assemblies can contribute to the same namespace. For example, another implementation file or assembly can contain the definitions shown in Listing 7-7.
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