Is scalar readonly : scalar « System Functions « Perl

1. Perl
2. System Functions
3. scalar

Is scalar readonly

   

#!/usr/bin/perl -w

use Scalar::Util qw(readonly);
my $constant="immutable";
print "scalar is ",(readonly($constant)?"constant":"variable"),"\n";
Internals::SvREADONLY($constant => 1);
print "scalar is ",(readonly($constant)?"constant":"variable"),"\n";

   
    
    
  

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