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There is also (potentially) a small performance overhead for virtual function dispatch, but this is negligible in most real-world scenarios. As always, test before optimizing for this!

We already saw how our public API is effectively a contract with our clients. With virtual functions, though, we are defining not only a contract for the caller, as usual, but also a contract for anyone who might choose to override that method. That requires more documentation, and a greater degree of control over how you implement the method.

By declaring a method as virtual, the base class gives derived classes permission to replace whole pieces of its own innards. That s a very powerful but very dangerous technique, rather like organ transplant surgery on an animal you ve never seen before. Even a trained surgeon might balk at replacing the kidneys of a dromedary armed with nothing more than developer-quality documentation about the process.

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For example, some method in your base class calls its MethodA, then its MethodB, to do some work. You then (perhaps unknowingly) rely on that ordering when you provide overrides for MethodA and MethodB. If a future version of the base class changes that ordering, you will break. Let s go back to our example to look at that in more detail, because it is really important. First, let s change the implementation of Firefighter.ExtinguishFire so that it makes use of a couple of helper methods: TurnOnHose and TrainHoseOnFire (see Example 4-8).

13.6. Identity-Based Encryption (IBE)

class Firefighter { // This calls TrainHoseOnFire and TurnOnHose as part of the // process for extinguishing the fire public virtual void ExtinguishFire() { Console.WriteLine("{0} is putting out the fire!", Name); TrainHoseOnFire(); TurnOnHose(); } private void TurnOnHose() { Console.WriteLine("The fire is going out."); } private void TrainHoseOnFire() { Console.WriteLine("Training the hose on the fire."); } } // ...

Let s also simplify our Main function so that we can see what is going on, as shown in Example 4-9.

static void Main(string[] args) { // A reference to Joe, Harry's number one Firefighter joe = new Firefighter { Name = "Joe" }; joe.ExtinguishFire(); } Console.ReadKey();

If we compile and run, we ll see the following output:

All is well so far, but what happens if we add a trainee firefighter into the mix The trainee is extremely fastidious and follows his instructor s guidelines to the letter. We re going to make a class for him and override the TurnOnHose and TrainHoseOnFire methods so that the work is done in the trainee s own particular idiom. Hang on a moment, though! Our helper methods are private members. We can t get at them, except from other members of our Firefighter class itself. Before we can do anything, we need to make them accessible to derived classes.

In the RSA and ECC schemes described previously, Alice would need to acquire Bob s public key certificate before sending an encrypted message to him (or else she could not be sure that she would be encrypting with Bob s public key, and not that of an impostor) Alice would either have to request Bob s public key certificate from Bob, from a directory, or from the CA Part of the reason for the existence of the public key certificate is that in both RSA and ECC, Bob s public key, kp, is a string of bytes that happens to satisfy the constraint F 1(F(m,kp),ks) = m, and the certificate binds kp to Bob s identity However, if Bob s public key could instead be, say, his e-mail address (bob@learnsecurity com), then Alice would not have to fetch Bob s public key certificate if she knows his e-mail address.

A browser window should open, with the test harness running (see Figure 8-18). The URL for my web site is http://localhost:56488/Tester/Default.aspx. So VWD started its internal web server localhost set to port 56488 (remember the settings in Figure 8-15) to the web site Tester and opened the default page set to Default.aspx.

In the preceding chapter, we mentioned that there were two additional accessibility modifiers that we would deal with later: protected and protected internal. Well, this is where they come into their own. They make members accessible to derived classes. If you want a member to be available either to derived classes or to other classes in your own assembly, you mark that member protected internal. It will be visible to other classes in the library, or to clients that derive classes from your base, but inaccessible to other clients who just reference your assembly. If, on the other hand, you want your class to make certain methods available only to derived classes, you just mark those methods protected. In terms of code out there in the wild, this is the most common usage, but it is not necessarily the best one!

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