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Quite right, I'd got caught by an optimization. I ran (adjusting code to your example)

for my $tab ( 1 .. 3 ) { my @array = frobnicate($tab); printf "Array ref: %s\n", \@array; printf "Annoymous: %s\n", [@array]; } sub frobnicate { return ( 0 .. shift ); } __END__ Array ref: ARRAY(0x826a924) Annoymous: ARRAY(0x8183a54) Array ref: ARRAY(0x826a924) Annoymous: ARRAY(0x826d818) Array ref: ARRAY(0x826a924) Annoymous: ARRAY(0x82115f8)
The same address even though @array is declared in the loop. The variable is being reused. Assigning \@array to something prevents the optimization.
my %data; for my $tab ( 1 .. 3 ) { my @array = frobnicate($tab); printf "Array ref: %s\n", \@array; printf "Annoymous: %s\n", [@array]; $data{$tab} = \@array; } sub frobnicate { return ( 0 .. shift ); } __END__ Array ref: ARRAY(0x826a924) Annoymous: ARRAY(0x8183a54) Array ref: ARRAY(0x819f318) Annoymous: ARRAY(0x8183798) Array ref: ARRAY(0x826ade8) Annoymous: ARRAY(0x819f304)
Something to bear in mind when benchmarking.


In reply to Re^3: references--hard vs anonymous operational weirdness by hipowls
in thread references--hard vs anonymous operational weirdness by hill

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