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24.4 Copying Deep Structures
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The procedures for copying lists ( Lists) only produce a flat
copy of the input list, and currently Guile does not even contain
procedures for copying vectors. `copy-tree' can be used for these
application, as it does not only copy the spine of a list, but also
copies any pairs in the cars of the input lists.
-- Scheme Procedure: copy-tree obj
-- C Function: scm_copy_tree (obj)
Recursively copy the data tree that is bound to OBJ, and return a
pointer to the new data structure. `copy-tree' recurses down the
contents of both pairs and vectors (since both cons cells and
vector cells may point to arbitrary objects), and stops recursing
when it hits any other object.
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