Ordinarily the result of calling a function is a single object. Sometimes, however, it is convenient for a function to compute several objects and return them.
In order to receive other than exactly one value from a form, one of several special forms or macros must be used to request those values. If a form produces multiple values which were not requested in this way, then the first value is given to the caller and all others are discarded; if the form produces zero values, then the caller receives nil as a value.
The next figure lists some operators for receiving multiple values[2]. These operators can be used to specify one or more forms to evaluate and where to put the values returned by those forms.
multiple-value-bind multiple-value-prog1 return-from multiple-value-call multiple-value-setq throw multiple-value-list return
Figure 3-5. Some operators applicable to receiving multiple values
The function values can produce multiple values[2]. (values) returns zero values; (values form) returns the primary value returned by form; (values form1 form2) returns two values, the primary value of form1 and the primary value of form2; and so on.
See multiple-values-limit and values-list.
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