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Note that the return types of all these are generic type variables: the functions never return normally and instead return by raising an exception. This means they can be used to form an expression of any particular type and can be handy when you re drafting your code. For example, in the following example, we ve left part of the program incomplete: if (System.DateTime.Now > failwith "not yet decided") then printfn "you've run out of time!" Table 4-2 shows some of the common exceptions that are raised by failwith and other operations. Table 4-2. Common Categories of Exceptions and F# Functions That Raise Them

> (unbox sobj : int);; System.InvalidCastException: Specified cast is not valid. at <StartupCode>.FSI_0014._main() stopped due to error Boxing is important partly because many .NET libraries provide generic operations through functions that accept arguments of type obj. You will see an example in the next section. Furthermore, some .NET APIs are dynamically typed, and almost all parameters are of type obj.

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The latest version of Doxygen can be run from Windows using a supplied GUI. The GUI allows you to use create the configuration file using a wizard that steps you through the process and creates a basic configuration file, an expert mode that allows you to set your own parameters, and the ability to load a config file. I found the output generated by using the wizard interface sufficient for casual to in-depth viewing. I recommend spending some time running Doxygen and examining the output files prior to diving into the source code. It will save you tons of lookup time. The structures alone are worth tacking up on the wall next to your monitor or pasting into your engineering logbook. A sample of the type of documentation Doxygen can generate is shown in Figure 3-3.

You can catch exceptions using the try ... with ... language construct and : type-test patterns, which filter any exception value caught by the with clause. For example: > try raise (System.InvalidOperationException ("it's just not my day")) with | : System.InvalidOperationException -> printfn "caught!";; caught! 5 covers these patterns more closely. The following code sample shows how to use try ... with ... to catch two kinds of exceptions that may arise from the operations that make up the http method, in both cases returning the empty string "" as the incomplete result. Note that try ... with ... is just an expression, and it may return a result in both branches: open System.IO let http(url: string) = try let req = System.Net.WebRequest.Create(url) let resp = req.GetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html with | : System.UriFormatException -> "" | : System.Net.WebException -> "" When an exception is thrown, a value is created that records information about the exception. This value is matched against the earlier type-test patterns. It may also be bound directly and manipulated in the with clause of the try ... with constructs. For example, all exception values support the Message property: > try raise (new System.InvalidOperationException ("invalid operation")) with | err -> printfn "oops, msg = '%s'" err.Message;; oops, msg = 'invalid operation'

The .NET libraries provide an implementation of generic binary serialization that is useful as a quick and easy way of saving computed values to disk and sending values over the network. We use this as an example to show how building-block generic operations can be defined using functionality in the .NET libraries combined with box and unbox. We first define functions with the following signatures: val writeValue val readValue : #System.IO.Stream -> 'a -> obj : #System.IO.Stream -> 'a

Many developers keep notes of their projects. Some are more detailed than others, but most take notes during meetings and phone conversations, thereby providing a written record for verbal communications. However, if you aren t in the habit of keeping an engineering logbook, you should consider doing so. I have found a logbook to be a vital tool in my work. Yes, it does require more effort to write things down and the log can get messy if you try to include all of the various drawings and e-mails you find important (mine are often bulging with clippings from important documents taped in place like some sort of engineer s scrapbook). However, the payoff is potentially huge.

Exceptions may also be processed using the try ... finally ... construct. This guarantees to run the finally clause both when an exception is thrown and when the expression evaluates normally. This allows you to ensure that resources are disposed after the completion of an operation. For example, you can ensure that the web response from the previous example is closed as follows:

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