perl-MooseX-SetOnce

Write-once, read-many attributes for Moose

The 'SetOnce' attribute lets your class have attributes that are not lazy and not set, but that cannot be altered once set. The logic is very simple: if you try to alter the value of an attribute with the SetOnce trait, either by accessor or writer, and the attribute has a value, it will throw an exception. If the attribute has a clearer, you may clear the attribute and set it again.

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