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Another characteristic of stand-alone debuggers is that they are not typically integrated with the development environment. That is, they are not part of the compiler suite of tools. Thus, many operate outside the development environment. The advantage of using standalone debuggers is that there are many to choose from, each with a slightly different feature set. This allows you to choose the stand-alone debugger that best meets your debugging needs. A popular example of this type of debugger is the GNU Debugger (gdb). (For more information, visit www.gnu.org/software/gdb/documentation.) The gdb debugger runs on Linux and provides

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)

The thread executing the event loop calls the functions and methods registered for handling the various events In the Hello, World! example, for instance, we told the button to call back the function to show the message box when clicked..

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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:

a way to control and inspect a system that has been compiled in debug mode. Listing 5-5 shows a sample program I wrote to calculate factorials. Those of you with a keen eye will spot the logic error, but let s assume the program was run as written. When I enter a value of 3, I should get the value 6 returned. Instead, I get 18. Listing 5-5. Sample Program (sample.c) #include <stdio.h> #include <stdlib.h> static int factorial(int num) { int i; int fact = num; for (i = 1; i < num; i++) { fact += fact * i; } return fact; } int main(int argc, char *argv[]) { int num; int fact = 0; num = atoi(argv[1]); fact = factorial(num); printf("%d! = %d\n", num, fact); return 0; } If I want to debug this program using gdb, I first have to compile the program in debug mode using the following command: gcc g o sample sample.c Once the program is compiled, I launch gdb using the following command: gdb sample When the gdb debugger issues its command prompt, I issue breakpoints using the break command (supplying the source file and line number for the break) and run the program, providing the necessary data. I can also print out any variables using the print command. If I want to continue the execution, I can issue the continue command. Finally, when done I can exit gdb with the quit command. Listing 5-6 shows a sample debug session using these commands.

A Windows Forms event loop can also be explicitly defined by the application using the Application. DoEvents method; in this case, each invocation performs a step in event handling and returns the control to the caller. Some programs can benefit from this control since they can interleave event processing and computation using a single thread. Computer games, for instance, tend to use this approach since eventbased timers provided by the framework are not reliable for producing the frames of the game at the required pace. The following loop shows a typical explicit event loop: let form = new Form(Text="Explicit Event Loop") form.Show() while form.Created do // Perform some task Application.DoEvents() When events are handled explicitly, a program must pay attention to call the DoEvents method frequently, because if events are not processed, the graphical interface may become unresponsive, which provides the wrong feedback to the user.

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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