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Practical Common Lisp by Peter Seibel

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CHAPTER 21Programming in the Large:Packages and Symbols

In Chapter 4 I discussed how the Lisp reader translates textual names into objects to be passed to the evaluator, representing them with a kind of object called a symbol. It turns out that having a built-in data type specifically for representing names is quite handy for a lot of kinds of programming.1 That, however, isn't the topic of this chapter. In this chapter I'll discuss one of the more immediate and practical aspect of dealing with names: how to avoid name conflicts between independently developed pieces of code.

Suppose, for instance, you're writing a program and decide to use a third-party library. You don't want to have to know the name of every function, variable, class, or ...

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