Re^2: Dumping hash of hashes to file and back

my %h = %{ require 'hash.pl' };
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Interesting, I did not know about this trick. It is cleaner than doing an eval on the file text.

Comment on Re^2: Dumping hash of hashes to file and back Download Code

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Re^3: Dumping hash of hashes to file and back by ELISHEVA (Prior) on Jun 18, 2009 at 06:04 UTC
Cleaner...? Just be aware that require only loads the file the first time you call it. If you need to load up the hash more than once, `%{ require 'hash.pl' };` may not be such a good idea. The second time you call it, require sees that the file is already loaded and will return 1, which isn't a hash reference at all. If you have strict or warnings turned on (and you should), Perl will kindly inform you of the problem by generating a warning:`Can't use string ("1") as a HASH ref while "strict refs" in use at ...`. If you really want to load a file full of Perl code and set a variable in one step, use do instead. Like require it returns the value of the final statement in the file, but it doesn't have the reload problem. This can be safely reused: `%{do 'hash.pl'}` Best, beth	[reply] [d/l] [select]
Re^3: Dumping hash of hashes to file and back by shmem (Chancellor) on Jun 18, 2009 at 07:09 UTC
It is essentially the same. All file inclusion mechanisms are based on string eval, as perldoc -q require tells.	[reply]