in reply to Looking for some insight on Tie::File

Line my @rows = @$ref; copies the entire file into memory, therefore changing this array, doesn't affect the file. The solution is to create an alias or to use the reference instead.

For example: 

my $ref = [1,2,3];

local our @row;
*row = $ref;
push @row, 4;

print @$ref;        # prints: 1234

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Or, simpler, push directly into @$ref: 
my $ref = [1,2,3];
push @$ref, 4;
print @$ref;        # prints: 1234

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Re^2: Looking for some insight on Tie::File
by stevieb (Canon) on Jan 09, 2016 at 00:42 UTC

    I'll ask straight up... why in the name of all things good are you advising to use symbolic references? After I read that, I found it hard to identify how this even answers the OP's question. There's no explanation of deref'ing a hash reference, and your use of local our ... seems way off as well.

    I very rarely take issue with posts here, but unless you wrote the code that OP has displayed, what you're saying is pretty bad advice.

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      I'll ask straight up... why in the name of all things good are you advising to use symbolic references? After I read that, I found it hard to identify how this even answers the OP's question.

      Try it and you will see, it lets the OP use @array instead of $ref

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        My bad... I'll re-state... "an unbounded, unconfined and completely dangerous assignment to a variable namespace that has global symbolic table access. This clobberes the symtab, which is *always* a bad idea, unless you *really* know what you're doing". No matter how you word it, it's very bad advice.

        Update: The people answering questions should *always* ensure their responses work properly without issue under the strict and warnings pragmas, and thereafter, advise the OP to do so as well.

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