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Throughout this book, you ve used a second technique to specify configuration parameters when creating objects: initial property settings for objects. For example, in 2, you used the following code: open System.Windows.Forms let form = new Form(Visible=true,TopMost=true,Text="Welcome to F#") The constructor for the System.Windows.Forms.Form class takes no arguments, so in this case the named arguments indicate post-hoc set operations for the given properties. The code is shorthand for this: open System.Windows.Forms let form = let tmp = new Form() tmp.Visible <- true tmp.TopMost <- true tmp.Text <- "Welcome to F#" tmp The F# compiler interprets unused named arguments as calls that set properties of the returned object. This technique is widely used for mutable objects that evolve over time, such as graphical components, because it greatly reduces the number of optional arguments that need to be plumbed around. Here s how to define a version of the LabelInfo type used earlier that is configurable by optional property settings: open System.Drawing type LabelInfoWithPropertySetting() = let mutable text = "" // the default let mutable font = new Font(FontFamily.GenericSansSerif,12.0f) member x.Text with get() = text and set v = text <- v member x.Font with get() = font and set v = font <- v

private: System::Void Admin_Load(System::Object^ sender, System::EventArgs^ e) { AdminDatabase->Initialize(); LoadList(); } private: System::Void AdminForm_FormClosing(System::Object^ sender, System::Windows::Forms::FormClosingEventArgs^ e) { AdminDatabase->Shutdown(); } }; } Notice I ve included the usual initialize and shutdown method calls to the database engine in the form load and closing events. This interface is designed to accept an ad hoc query and execute it when the Execute button is clicked. Thus, the btnExecute_Click() is the only other method in this source code. The method calls the database engine and requests that the query be run but it is not checking for any results. That is because this interface is used to adjust things in the database, not select data. The last call in this method is the LoadList() helper method that repopulates the list.

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> LabelInfoWithPropertySetting(Text="Hello World");; val it : LabelInfo = {Font = [Font: Name=Microsoft Sans Serif, Size=12]; Text = "Hello World"} You use this technique in 11 when you learn how to define a Windows Forms control with configurable properties. The Defining Object Types with Mutable State section later in this chapter covers mutable objects in more detail.

In all kinds of software, it is 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 OO programming. For our purposes, encapsulation simply 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. Later in this chapter, we explain how encapsulation applies when building assemblies, frameworks, and applications. In the extreme, you may even be ensuring that your code is secure when used in partial trust mode, in other words, that it can t be inadvertently or deliberately used to achieve malicious results when used as a library by code that doesn t have full permissions. However, the most important kind of encapsulation is the day-to-day business of hiding the internal implementation details of functions, objects, types, and modules. The primary techniques used to do this are as follows: Local definitions Accessibility annotations Explicit signatures We cover the first two of these techniques next, and we cover explicit signatures in the Using Signature Types and Files section later in this chapter.

You might be wondering how I plan to detect which interface to execute. The answer is I use a command-line parameter to tell the code which interface to run. The switch is implemented in the main() function in the BookVendingMachine.cpp source file. The source code for processing command-line parameters is self-explanatory. Listing 6-16 contains the entire source code for the main() function for the embedded application. Listing 6-16. The BookVendingMachine Main Function (BookVendingMachine.cpp) // BookVendingMachine.cpp : main project file. #include "MainForm.h" #include "AdminForm.h" using namespace BookVendingMachine; [STAThreadAttribute] int main(array<System::String ^> ^args) { // Enabling Windows XP visual effects before any controls are created Application::EnableVisualStyles(); Application::SetCompatibleTextRenderingDefault(false);

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