zl:1 - FTP

get-setf-method-multiple-value
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• For (supseq seq s e):
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gB8B7)
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get-setf-method-multiple-value reference &optional for-effect Function
user::get-setf-multiple-value returns five values constituting the setf
method for user::reference, which is a generalized-variable reference. (The
five values are described in detail at the end of this discussion.) This is
the same as define-setf-method, except that it does not check the number
of store-variables (one of the five values). Use
user::get-setf-multiple-value in cases that allow storing multiple values
into a generalized variable. This is not a common need.
Here are the five values that express a setf method for a given access
form.
• A list of temporary variables.
e A list of value forms (subforms of the given form) to whose values
the teporary variables are to be bound.
• A second list of temporary variable, called store variables.
• A storing form.
• An accessing form.
The temporary variables are bound to the value forms as if by let·; that is,
the value forms are evaluated in the order given and may refer to the
values of earlier value forms by using the corresponding variable.
The store variables are to be bound to the values of the newvalue form,
that is, the values to be stored into the generalized variable. In almost all
cases, only a single value is stored, and there is only one store variable.
The storing form and the accessing form may contain references to the
temporary variables (and also, in the case of the storing form, to the store
variables). The accessing form returns the value of the generalized variable.
The storing form modifies the value of the generalized variable and
guarantees to return the values of the store variables as its values. These
are the correct values for setf to return. (Again, in most cases there is a