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For example, consider the following function that creates a sequence expression that reads the first two lines of a file on demand: open System.IO let firstTwoLines(file) = seq { use s = File.OpenText(file) yield s.ReadLine() yield s.ReadLine() } Let s now create a file and a sequence that reads the first two lines of the file on demand: > File.WriteAllLines("test1.txt", [| "Es kommt ein Schiff"; "A ship is coming" |]);; val it : unit = () > let seq = firstTwoLines("test1.txt");; val seq : seq<string> At this point, the file hasn t yet been opened, and no lines have been read from the file. If you now iterate the sequence expression, the file is opened, the first two lines are read, and the results are consumed from the sequence and printed. Most important, the file has now also been closed, because the Seq.iter aggregate operator is careful to dispose of the underlying enumerator it uses for the sequence, which in turn disposes of the file handle generated by File.OpenText: > seq |> Seq.iter (printfn "line = '%s'");; line = 'Es kommt ein Schiff' line = A ship is coming' 9 covers sequence expressions and the more general mechanism of workflows in more detail.

If this payload is written in a language that a Mac cannot speak, then the payload will not be able to run, and the worm will not infect the computer Some threats have a payload that will lie dormant until something triggers its release A Trojan horse is malicious code embedded within a self-contained application that becomes destructive only when an infected application is opened Trojans closely resemble viruses because both can cause damage when a file is infected However, a virus is added to an application after the application is written, whereas a Trojan horse is written, created, and distributed as a single application for the sole purpose of getting you to open it to then allow it to do whatever it wants to with your files Trojan horses can be used to erase files, get passwords, and send e-mail to other users.

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In some older F# code, you may see the function using. For example: using (new Customer()) (fun jane -> printfn "jane.Ticket = %d" jane.Ticket ) The definition of using is as follows: let using (ie : #System.IDisposable) f = try f(ie) finally ie.Dispose() This is more explicit than writing use bindings but can be useful if you like to know what s going on under the hood.

Just click a thumbnail to start playing a video. Notice that the phone automatically displays videos in landscape mode no matter how your phone is oriented when you start playing them. You ll see video controllers to fast-forward, pause, or play the video. If you press the Menu button (as shown in Figure 13 9), you ll see sharing, comments, and other options. Pressing the more button will let you switch between low- and highquality playback. Sharing, as with most Android apps, will share the video with any app you have installed that supports sharing. With most users, this includes Facebook, Gmail, SMS messaging, and Google Talk.

The threat to Macs here is real iWorkServices and Jahlav are two examples of Trojans developed specifically for the Mac Mac systems can also be carriers of Trojans designed for PC, and can very easily pass them along to PCs through filesharing and the like A logic bomb is a threat resembling a Trojan horse, but it s architected to initiate when a specific event occurs Logic bombs are brought into the operating system on the coattails of a virus or a worm, containing the payload that will be launched when the trigger event occurs It is a ticking time bomb ready to go off on a scheduled date or after being resident in the operating system for a certain period of time.

In the previous section, you saw a range of resources that are best managed explicitly, preferably by automatically cleaning up the construct at the end of its lifetime using constructs such as use x = expr and idioms such as System.IDisposable. You also saw that two resources are managed automatically, stack and heap-allocated memory, with the latter allocated on the garbage-collected heap. Stack space is needed every time you call an F# function and is reclaimed when the function returns or when it performs a tail call, which is discussed in a moment. It s perhaps surprising that stack space is more limited than space in the garbage-collected heap. For example, on a 32-bit Windows machine, the default settings are such that each thread of a program can use up to 1MB of stack space. Because stack is allocated every time a function call is made, a very deep series of nested function calls causes a StackOverflowException to be raised. For example, on a 32-bit Windows machine, the following program causes a stack overflow when n reaches about 79000: let rec deepRecursion n = if n = 1000000 then () else if n % 100 = 0 then printfn "--> deepRecursion, n = %d" n deepRecursion (n+1) printfn "<-- deepRecursion, n = %d" n You can see this in F# Interactive: > deepRecursion 0;; --> deepRecursion, n = 0 ... --> deepRecursion, n = 79100 --> deepRecursion, n = 79200 --> deepRecursion, n = 79300 Process is terminated due to StackOverflowException Session termination detected. Press Enter to restart.

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