Re^3: Modification of a read-only value attempted

This discussion reminds me of a related question. When a Readonly hash or array contains references, are the targets of those references protected? As a common example, are the elements of Readonly matrix protected?

Bill

Comment on Re^3: Modification of a read-only value attempted

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Re^4: Modification of a read-only value attempted by AnomalousMonk (Archbishop) on Nov 27, 2012 at 21:23 UTC
Easy to test: `>perl -wMstrict -MData::Dump -le "use Readonly; ;; Readonly my %h => (a => {b => {c => {d => 1}}}); dd \%h; ;; $h{a}{b}{d} = 2; " { # tied Readonly::Hash a => { # tied Readonly::Hash b => { # tied Readonly::Hash c => { # tied Readonly::Hash d => 1, }, }, }, } Modification of a read-only value attempted at -e line 1` [download] See also DESCRIPTION section of Readonly.	[reply] [d/l]

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Re^4: Modification of a read-only value attempted
by AnomalousMonk (Archbishop) on Nov 27, 2012 at 21:23 UTC

Easy to test:

>perl -wMstrict -MData::Dump -le
"use Readonly;
 ;;
 Readonly my %h => (a => {b => {c => {d => 1}}});
 dd \%h;
 ;;
 $h{a}{b}{d} = 2;
"
{
  # tied Readonly::Hash
  a => {
         # tied Readonly::Hash
         b => {
                # tied Readonly::Hash
                c => {
                       # tied Readonly::Hash
                       d => 1,
                     },
              },
       },
}

Modification of a read-only value attempted at -e line 1
[download]

See also DESCRIPTION section of Readonly.

[reply]
[d/l]