The choice of whether to use WITH-SLOTS versus WITH-ACCESSORS is the same as the choice between SLOT-VALUE and an accessor function:
low-level code that provides the basic functionality of a class
may use SLOT-VALUE or WITH-SLOTS to directly manipulate slots in ways not
supported by accessor functions or to explicitly avoid the effects of auxiliary methods that may have been defined on the
accessor functions. SLOT-VALUE takes an object and the name of a slot
as arguments and returns the value of the named slot in the given object.
But if you don't supply a :customer-name argument, the customer-name slot will be unbound, and an attempt to read
it before you set it will signal an error. Nginx has a concept of request processing time - time elapsed since the first
bytes were read from the client. You can also use initforms
that generate a different value each time they're evaluated--the initform
is evaluated anew for each object. For now, however,
you're ready to take a break from all this theory of object orientation and turn to the rather different topic
of how to make good use of Common Lisp's powerful, but sometimes
cryptic, FORMAT function. In Chapter 23 you'll see an example of how
to define a method on PRINT-OBJECT to make objects of a certain class be printed in a more informative form.

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