18 lines
794 B
Text
18 lines
794 B
Text
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=== ALL USERS PLEASE NOTE ========================
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CAR and CDR now return extra values.
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The function CAR now returns two values. Since it has to go to the
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trouble to figure out if the object is carcdr-able anyway, we figured
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you might as well get both halves at once. For example, the following
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code shows how to destructure a cons (SOME-CONS) into its two slots
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(THE-CAR and THE-CDR):
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(MULTIPLE-VALUE-BIND (THE-CAR THE-CDR) (CAR SOME-CONS) ...)
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For symmetry with CAR, CDR returns a second value which is the CAR of
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the object. In a related change, the functions MAKE-ARRAY and CONS
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have been fixed so they don't allocate any storage except on the
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stack. This should hopefully help people who don't like using the
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garbage collector because it cold boots the machine so often.
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