(GPL-1.0-or-later or Artistic-1.0-perl) and MIT and UCD
Cycle through a list of values via a scalar
This Perl module can be used to go through a list over and over again. Once you get to the end of the list, you go back to the beginning. You do not have to worry about any of this since the magic of tie does that for you.
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The Carp routines are useful in your own modules because they act like die() or warn(), but with a message which is more likely to be useful to a user of your module. In the case of cluck, confess, and longmess that context is a summary of every call in the call-stack. For a shorter message you can use carp or croak which report the error as being from where your module was called. There is no guarantee that that is where the error was, but it is a good educated guess.
This package is the shared library for perl.
This pragma allows you to declare constants at compile-time. When a constant is used in an expression, Perl replaces it with its value at compile time, and may then optimize the expression further. In particular, any code in an "if (CONSTANT)" block will be optimized away if the constant is false.