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The following line of code changes the type of myForm to be the same as the type of the parameter of showForm: showForm (myForm :> Form) Although upcasting the argument to showForm is a solution, it s not a very pretty one, because it means littering client code with upcasts So, F# provides another type annotation, the derived type annotation, in which the type name is prefixed with a hash sign This has the effect of constraining an identifier to be of a type or any of its derived types This means you can rewrite the previous example as shown next to remove the need for explicit upcasts in calling code I think this is a huge benefit to anyone using the functions you define #light let showFormRevised (form : #Form) = form.

Livingston: Is there anything that you would have done differently Graham: I wouldn t worry so much about seeming like a real company. Now I

ui.disconnectButton->setEnabled( false ); ui.cdButton->setEnabled( false ); ui.upButton->setEnabled( false ); ui.getButton->setEnabled( false ); }

would just say, keep it a bunch of guys operating out of an apartment for as long as you want, because there s nothing to be ashamed of in that, especially if you re writing great software. Another thing I would do is open an online store ourselves. We did use our software for building our website. We were the only one of all our competitors who actually used our software for building our own corporate website. But we didn t have anything people could buy online. If we had been selling stuff, we would have understood what life was like from the merchant s point of view.

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Show() // ThreadExceptionDialog is define in the BCL and is // directly derived type of the Form class let anotherForm = new ThreadExceptionDialog(new Exception()) showFormRevised anotherForm You can use this kind of type annotation to tidy up code that uses a lot of casting For example, as shown in the Casting section earlier in this chapter, a lot of casting is often needed when creating a collection with a common base type, and this can leave code looking a little bulkier than it should A good way to remove this repeated casting, as with any commonly repeated section of code, is to define a function that does it for you:.

Livingston: What was one of the funniest moments Graham: Probably the time we tried starting a gas generator inside our office.

When the dialog is constructed, it is being shown from the main function before the event loop is started When the user finally decides to click the Connect button, the event will be caught by the QPushButton object that emits a signal that is connected to the connectClicked slot The slot, shown in Listing 14-3, calls the QFtp object accordingly It uses the connectToHost(QString) to connect to ftptrolltechcom Before doing this, the Connect button is disabled so that the user can t try to connect multiple times The text of the statusLabel is updated to keep the user informed about what is happening All calls to the QFtp objects are asynchronous, so the application can continue operating while they are processed You can tell when the command is done because it emits a signal when it finishes Listing 14-3.

There was this huge blackout in Cambridge that lasted for about five hours. We always had our servers in our offices with us. We didn t trust this collocation stuff. Nowadays, collocating is the standard thing to do and even big companies do it, but we felt like we had to have those servers in the room with us. So when the power went out, our servers were really dead. We had some battery-powered UPSs, but they would only last for half an hour. They were really designed for power spikes, not for the power going out for 5 hours. So I dispatched Trevor to Home Depot to buy a gasoline-powered generator as fast as possible, while I sat there watching the UPSs power go down, turning off servers one by one thinking about which customers were on each server and which ones would be the maddest, and turning off whichever server would have the least mad customers on it. Eventually I had to turn off all the servers, because it took Trevor a while to get to Home Depot and back. Finally he showed up with this gas generator, and we weren t really sure where to put it because we were in this small office building in Harvard Square.

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