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We cover inheritance, abstract bindings, and interface implementations in later sections. The Vector2D in Listing 6-2 uses a construction sequence. Construction sequences can enforce object invariants. For example, the following defines a vector type that checks that its length is close to 1.0 and refuses to construct an instance of the value if not: type UnitVector2D(dx,dy) = let tolerance = 0.000001 let length = sqrt(dx * dx + dy * dy) do if abs(length - 1.0) >= tolerance then failwith "not a unit vector"; member v.DX = dx member v.DY = dy new() = UnitVector2D (1.0,0.0) This example shows something else: sometimes it is convenient for a class to have multiple constructors. You do this by adding extra explicit constructors using a member named new. These must ultimately construct an instance of the object via the primary constructor. The inferred signature for this type contains two constructors: type UnitVector2D = new : unit -> UnitVector2D new : dx:float * dy:float -> UnitVector2D member DX : float member DY : float

private: System::Void btnBook9_Click(System::Object^ sender, System::EventArgs^ e) { LoadDetails(9); } private: System::Void btnBook10_Click(System::Object^ sender, System::EventArgs^ e) { LoadDetails(10); } private: System::Void MainForm_FormClosing(System::Object^ System::Windows::Forms::FormClosingEventArgs^ e) { Database->Shutdown(); } }; } The MainForm_Load() event is where the database engine is initialized and the buttons are loaded with the appropriate thumbnails I follow each call to the database with the statement if (Database->Error()) DisplayError(); This statement allows me to detect when an error occurs and inform the user Although I don t act on the error in this event, I could and do act on it in other events If a severe database error occurs here, the worst case is the buttons will not be populated with the thumbnails I use this concept throughout the source code The btnBook1_Click() through btnBook10_Click() events are implemented to call the LoadDetails() method and populate the details interface components with the proper data.

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C:\Users\dsyme\Desktop> fsiexe Microsoft (R) F# 20 Interactive build 40303191 Copyright (c) Microsoft Corporation All Rights Reserved For help type #help;; > <paste in the earlier program here> ;; val splitAtSpaces : string -> string[] val wordCount : string -> int * int val showWordCount : string -> unit Here, F# Interactive reports the type of the functions splitAtSpaces, wordCount, and showWordCount (you learn more about types in a moment) The keyword val stands for value; in F# programming, functions are just values, a topic we return to in 3 Also, sometimes F# Interactive shows a little more information than we show in this book (such as some internal details of the generated values); if you re trying out these code snippets, then you can ignore that additional information.

This represents a form of method overloading, covered in more detail in the Adding Method Overloading section later in this chapter.

As you can see, abstracting the loading of the details has saved me lots of code! On the detail portion of the interface are two buttons The btnCancel_Click() event returns the interface to the initial vending machine view The btnPurchase_Click() event is a bit more interesting It is here where the vending part occurs Notice I first call the VendBook() method and then run the simulation for the vending process and return the interface to the vending view That s it! The customer interface is very straightforward as most vending machines are Just a row of buttons and a mechanism for taking in the money (in this case I assume the machine accepts credit cards as payment but a real vending machine would probably take several forms of payment) Administration Interface (Administration Form) The customer interface is uncomplicated and easy to use.

For now, let s use the wordCount function interactively: > let (numWords,numDups) = wordCount "All the king's horses and all the king's men";; val numWords : int val numDups : int > numWords;; val it : int = 9 > numDups;; val it : int = 2 > numWords - numDups;; val it : int = 7 This code shows the results of executing the function wordCount and binding its two results to the names numWords and numDups, respectively You can examine the values by entering each as a single expression, which assigns the result to a value called it and displays the value Examining the values shows that the given text contains nine words: two duplicates and seven words that occur only once.

As we mentioned, one of the most useful aspects of object-oriented programming is the notational convenience of the dot-notation. This extends to other kinds of notation, in particular the expr.[expr] indexer notation, named arguments, optional arguments, operator overloading, and method overloading. In the following sections, we cover how to define and use these notational conveniences.

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