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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.
WITH-SLOTS provides direct access to the slots, as if by SLOT-VALUE, while WITH-ACCESSORS provides a shorthand for accessor methods. The form of WITH-ACCESSORS is the same as WITH-SLOTS except each element of the slot list is a two-item list containing a variable name and the name of an accessor function. However, :class slots are accessed the same as :instance slots--they're accessed with SLOT-VALUE or an accessor function, which means you can access the slot value only through an instance of the class even though it isn't actually stored in the instance.

However, as anyone familiar with the principles of good object-oriented programming practices knows, directly accessing the slots (or fields or member variables) of an object can lead to fragile code.
For instance, money-market-account will inherit slots and behaviors for dealing with checks from checking-account and slots and behaviors for computing interest from savings-account. Likewise, any method that's applicable to any class in the class precedence list will be applicable to a money-market-account object.
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Both macros create a block of code in which simple variable names can be used to refer to slots on a particular object.
At the minimum, a slot specifier names the slot, in which case the slot specifier can be just a name. On the other hand, :initargs needn't be exclusive--each :initarg option in a slot specifier creates a keyword parameter that can be used to initialize the slot; multiple parameters don't create a conflict, so the new slot specifier contains all the :initargs.
The &key in the parameter list is required to keep the method's parameter list congruent with the generic function's--the parameter list specified for the INITIALIZE-INSTANCE generic function includes &key in order to allow individual methods to supply their own keyword parameters but doesn't require any particular ones.

Java in which all the methods of a class must be defined as part of the class definition. Common Lisp also supports multiple inheritance--a class can have multiple direct superclasses, inheriting applicable methods and slot specifiers from all of them. Grâce à son gameplay innovant et ses fonctionnalités interactives, ce slot promet des parties aussi dynamiques qu’amusantes.

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