MESSAGE
| DATE | 2020-12-23 |
| FROM | David Cantrell
|
| SUBJECT | Re: [Hangout - NYLXS] CFP NY.PM Technical Meetup
|
On 24/12/2020 00:03, Jacob Salomon wrote:
> Another idea might be the subject of the "tie", where accessing a
> variable triggers a lot of action. When I first heard about it I
> thought is was just an obfuscation. And then I noticed (in CPAN) a few
> tidbits, like Tie::File, Tie::DBI. A few I can't recall the names of
> but there's one that stashes most of huge array in a file and keeps only
> a subset in memory, swapping in and out as needed. Or the one that
> keeps the return values of a function for later retrieval. (Recursive
> Taylor series, anyone?)
The most useful use of tie() I've come across is DBM::Deep. It gives you
what behaves like a standard perl data structure, a hashref or arrayref
that in turn contains scalars, hashrefs, and arrayrefs, nested as deep
as you like, but the data lives in a file on disk instead of in memory.
If you are memory-constrained, and if you're willing for data access to
be a lot slower, it's a great tool.
--
David Cantrell
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