Have a look at Data::COW: clone deep data structures copy-on-write.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re: returning large arrays from functions by CountZero
in thread returning large arrays from functions by perl5ever

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