hashmap - Perl Setting Value of Constant to value of Hash Key -

is there way set value of perl constant value in perl hash?

this not working:

use constant test => $configdata{'key'}; print test."\n"; 

this prints newline character.

is misuse of concept of constant? values still known @ compile time, not live inside perl module or perl script itself.

here's working example using readonly module. put sub directly in test script, external.

#!/usr/bin/perl  use strict; use warnings; use readonly; use data::dumper;  readonly::hash %configdata => loadconfighash();  sub loadconfighash {     %hash = (one => 1,                 2 => 2,                 3 => 3);     return %hash; }  print dumper \%configdata;  # assignment fail , generate fatal error $configdata{two} = 4; print dumper \%configdata;