|Perl: the Markov chain saw|
Re: lhs substr(): refs vs. scalarsby BrowserUk (Pope)
|on Oct 08, 2005 at 17:06 UTC||Need Help??|
You know you can use substr as an lvalue or with a fourth parameter to avoid duplicating your big scalars.
But be very sure that the size specified in substr, and the size of the result from pack match exactly, otherwise you will be expanding or shrinking your big scalar by the difference which will lead to nasty surprises. It may be better to use an intermediary variable here:
It is also possible (from 5.8.5 onwards) to set up an array of lvalue references to chunks of your scalar and then manipulate the individual chunks through indirection:
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