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Delegates
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Occasionally, you need to define a new .NET delegate type in F#: type ControlEventHandler = delegate of int -> bool This is usually required only when using C code from F#, because some magic performed by the .NET Common Language Runtime lets you marshal a delegate value as a C function pointer. 17 looks at interoperating with C and COM. For example, here s how you add a new handler to the Win32 Ctrl+C handling API: open System.Runtime.InteropServices let ctrlSignal = ref false [<DllImport("kernel32.dll")>] extern void SetConsoleCtrlHandler(ControlEventHandler callback,bool add) let ctrlEventHandler = new ControlEventHandler(fun i -> SetConsoleCtrlHandler(ctrlEventHandler,true) ctrlSignal := true; true)
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Occasionally, you need to define a new .NET enum type in F#. You do this using a notation similar to discriminated unions:
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CHAPTER 6 WORKING WITH OBJECTS AND MODULES
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type Vowels = | A = 1 | E = 5 | I = 9 | O = 15 | U = 21 This type is compiled as a .NET enum whose underlying bit representation is a simple integer.
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Summary
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This chapter looked at the basic constructs of object-oriented programming in F#, including concrete object types, OO notation, and object interface types and their implementations, as well as more advanced techniques to implement object interface types. You also saw how implementation inheritance is less important as an object implementation technique in F# than in other OO languages and then learned how the F# object model relates to the .NET object model. The next chapter covers language constructs and practical techniques related to encapsulating, packaging, and deploying your code.
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CHAPTER 7
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Encapsulating and Packaging Your Code
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Packaging code and making it available for people and programs to use is a key part of making the best use of F#. In this book, you ve already seen many of the constructs to help do this: functions, objects, type definitions, modules, namespaces, and assemblies. However, in some cases you ve encountered these only peripherally when using the .NET Base Class Library (BCL). This chapter covers these constructs from the perspective of code organization and packaging. Packaging code has four distinct but related meanings: Organizing code into sensible entities using namespaces, types, and modules. Encapsulating internal data structures and implementation details by making them private. Assembling code and data as a component, which on .NET is called an assembly. An assembly is one or more DLL or EXE packaged together with supporting data as a single logical unit. Deploying one or more assemblies, such as a web application or framework, often with an installer, for use on client machines, on web servers, or for download over the Web.
The first two of these topics are associated with the F# language, and the last is more associated with the pragmatics of deploying, installing, configuring, and maintaining software. The third lies in between, because a .NET assembly can act as both a unit of encapsulation and a unit of deployment. Knowing these techniques isn t the same as knowing how to use them effectively, or indeed when to use them. At the end of this chapter, we cover some of the different kinds of .NET software you may write with F# and how you can organize and package your code for these different cases.
Hiding Things Away
In all kinds of software, it s common to hide implementation details of data structures and algorithms behind encapsulation boundaries. Encapsulation is a fundamental technique when writing software and is possibly the most important idea associated with object-oriented (OO) programming. For this book s purposes, encapsulation means hiding implementation details behind well-defined boundaries. This lets you enforce consistency properties and makes the structure of a program easier to manage. It also lets an implementation evolve over time. A good rule of thumb is that anything you don t want used directly by client code should be hidden.
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