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The most common debugger is called a stand-alone debugger. These debuggers run as a separate process and permit you to attach to a system that has been compiled to include the appropriate debug information (for mapping to source code, especially linking to the symbols in the code). Unless you re debugging code that contains the source files (like some forms of interpreted languages), you usually must have the source code files available and use those to complete the connection to the running process. Once you ve attached to the system (or process) you want to debug, stand-alone debuggers permit you to stop, start, and step through the execution. Stepping through refers to three basic operations: 1. Execute the current line of code and step into the next line of code. 2. Skip over the next line of code (execute function calls and return to the next line). 3. Execute until a particular line of code comes into focus. The last operation usually refers to lines of code that have been tagged as the line to stop on (called a breakpoint) or the line that is currently highlighted (called run to cursor). Stand-alone debuggers provide tools for inspecting memory, the call stack, and even sometimes the heap. The ability to inspect variables is perhaps the most important diagnostic tool debuggers can provide. After all, almost everything you will want to inspect is stored somewhere.

If you want, you can delimit class types using class/end: type Vector2D(dx: float, dy: float) = class let len = sqrt(dx * dx + dy * dy) member v.DX = dx member v.DY = dy member v.Length = len end You see this in F# code samples on the Web and in other books. However, we have found that this tends to make types harder to understand, so we ve omitted class/end throughout this book. You can also delimit object interface types by interface/end: open System.Drawing type IShape = interface abstract Contains : Point -> bool abstract BoundingBox : Rectangle end

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Graphical applications are built upon the abstractions provided by the graphical environment hosting them The application must interact with its environment and process input in an unstructured way User input is not the only kind of input received from a windowing system Window management often involves requests to or from the application itself, such as painting or erasing a form Windowing systems provide a common and abstract way to interact with a graphical application: the notion of an event When an event occurs, the application receives a message in the message queue with information about the event The graphical application is responsible for delivering messages from the message queue to the control for which they are meant A set of functions provided by the API of the windowing system supports this.

Note A heap is a structure that stores available memory addresses in a tree structure for fast allocation and deallocation of memory blocks. A stack is a structure that allows developers to place items on the stack in a first-in, last-out method (much like a stack of plates at a buffet).

It s occasionally useful to direct the F# compiler to use a .NET struct (value type) representation for small, generally immutable objects. You can do this by adding a Struct attribute to a class type and adding type annotations to all arguments of the primary constructor: [<Struct>] type Vector2DStruct(dx : float, dy: float) = member v.DX = dx member v.DY = dy member v.Length = sqrt (dx * dx + dy * dy) Finally, you can also use a form that makes the values held in a struct explicit: [<Struct>] type Vector2DStructUsingExplicitVals = val dx : float val dy: float member v.DX = v.dx member v.DY = v.dy member v.Length = sqrt (v.dx * v.dx + v.dy * v.dy) Structs are often more efficient, but you should use them with care because the full contents of struct values are frequently copied. The performance characteristics of structs can also change depending on whether you re running on a 32-bit or 64-bit machine.

This activity of reading messages from the message queue and dispatching them is known as the event loop of the application If the loop fails for any reason, the GUI components cease to work, the application hangs, and Windows may eventually inform you that the application is not responding It s rare for an application to program the event loop explicitly Programming toolkits encapsulate this functionality because it s basically always the same The Run method of the Application class is responsible for handling the event loop, and it ensures that messages related to events are delivered to targets within the application GUI programs often involve multiple threads of execution We discuss threading and concurrency in more detail in 13, but for this chapter it is important to remember that event dispatching is a single-threaded activity, even if it may seem the opposite.

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