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Class 'Administrator' cannot have multiple base classes: 'NamedPerson' and 'SalariedPerson'

This is a pretty fundamental roadblock! You cannot derive your class from more than one base class. When the designers of .NET were thinking about the platform fundamentals, they looked at this issue of multiple inheritance and how they d support it across multiple languages, including C#, VB, and C++. They decided that the C++ approach was too messy and prone to error (particularly when you think about how to resolve members that appear in both base classes with the same signature). The implications of multiple inheritance were probably just too difficult to come to grips with, and therefore were unlikely to bring net productivity gains. With that view prevailing, single inheritance of implementation is baked into the platform.

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In more recent interviews, the .NET team has reflected that perhaps there might have been a way of allowing multiple inheritance of implementation, without introducing all the complexity of C++ multiple inheritance. That s the benefit of 20/20 hindsight; we (or our children) will just have to wait until the next platform generation and see how the argument goes then.

Other options for generating cryptographically secure random numbers may depend upon what type of OS your application is running on. If you are running on Linux, the OS provides two virtual devices that look like files on disk: namely /dev/random and /dev/urandom. When your application reads from these files, the bits are unpredictably random with no repeating sequences, as they are generated based on events that happen during and after the boot sequence. The methods used to generate these random bits take into account the inter-arrival times between key strokes that the user enters, mouse movements, arrival of data packets over the network, and all kinds of other random events rather than the deterministic sequence that is produced by rand(). On Linux, you can open the /dev/random file or the /dev/urandom file and start reading bits from the file. You can stuff those bits into integers or variables of other data types that you can use as input to cryptographic algorithms. For example, to see some of the random bits that might be produced by such files, you can type the following command at a Linux prompt: $ head -c 20 /dev/random > /tmp/bits $ uuencode --base64 /tmp/bits printbits begin-base64 644 printbits bj4Ig9V6AAaqH7jzvt9T60aogEo= ==== The first command gathers 20 random characters from /dev/random and saves them to a file called bits in a temporary directory. The randomly gathered bits are in binary, and may consist of nonprintable characters. The second command reads the randomly generated bits and prints them out using base64-encoded printable characters.

So are we really stymied No! While we can t support multiple inheritance of implementation, we can support multiple inheritance of interface.

With our abstract base classes in this example, we re not really trying to provide a base implementation for our objects at all. We re trying to mark them as supporting a particular contract that we can then rely on in our client code. C# provides us with a mechanism for doing exactly that: interface. Let s rewrite our NamedPerson and SalariedPerson classes as interfaces instead, as shown in Example 4-20.

interface INamedPerson { string Name { get; } } interface ISalariedPerson { decimal Salary { get; set; } }

We use much the same syntax as we do for a class definition, but using the keyword interface instead. Notice also that we dropped the abstract modifier on the members; an interface is implicitly without implementation. There are no accessibility modifiers on the members either; an interface member is only ever allowed to be public. The only other change we ve made is to prefix our interface name with an I. This is not a rule, but another one of those naming conventions to which most people conform. We can now implement those interfaces on our Administrator, as shown in Example 4-21.

The difference between /dev/random and /dev/urandom is that /dev/random will block if new random bits (also sometimes referred to as entropy) are not available. For instance, if there has not been any user input or data arriving over the network, a read from /dev/random may not return control to an executing program. When the program issues a read, the call may block until the /dev/random device receives enough entropy from various sources. The advantage of /dev/random (as compared to /dev/urandom) is that the bits returned are assured to be random even though the caller may have to be suspended while the random data bits are gathered. The /dev/urandom device, on the other hand, will never block, but the bits that are returned are not necessarily guaranteed to be completely random or have high entropy.

class Administrator : INamedPerson, ISalariedPerson { public decimal Salary { get; set; } public string Name { get { StringBuilder name = new StringBuilder(); AppendWithSpace(name, Title); AppendWithSpace(name, Forename); AppendWithSpace(name, Surname); return name.ToString(); } } // ...

}

And we can implement them on our FirefighterBase, as shown in Example 4-22.

function TwitterClass() { this.__getLatestPosts = [new TwitterStatus()]; }

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