Chapter22 | APK Size Reduce | File Utils library
kandi X-RAY | Chapter22 Summary
kandi X-RAY | Chapter22 Summary
APK Size Reduce
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QUESTION
I am reading the book Practical Common Lisp, and in the footnote5 of chapter22, page284, I saw a code snippet that made me confused.
I know that the variable list and tail have a list structure in common, but I am confusing that since tail will be assigned the value of 'new' each time during the iteration, why (setf (cdr tail) new) would affect the state of the variable list?
...ANSWER
Answered 2019-May-17 at 11:12The invariant is that tail
is always the last cons cell of list
.
On each iteration, a new cons cell is created holding the new value as car
. The first time through, list
is set to this cons cell, and tail
too. In all subsequent iterations, the new cons cell is appended by setting the cdr
of the last cell to it, then setting tail
to the new cell, to recreate the invariant.
After first iteration:
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