In a constructor what does this line mean/do?

Specifically what does the 'shift' bit do.

my $classname = shift;

I understand arrays, and push/pop from the end and shift/unshift from the start but I don't see where the value for $classname in the above line comes from.

Tanks Munksss.

In reply to What does the SHIFT bit do in a constructor by Fian

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