End - generalized END {}.

    use End;

    {  my $foo = end {print "Leaving the block\n"};
       ...
       last;    # prints "Leaving the block\n".
       ...
    }

The module End exports a single subroutine end, which allows you to set up some code that is run whenever the current block is exited, regardless whether that is due to a return, next, last, redo, exit, die, goto or just reaching the end of the block.

To be more precise, end returns an object, that will execute the code when the object is destroyed; that is, when the variable assigned to goes out of scope. If the variable is lexical to the current block, the code will be executed when leaving the block.

One can force premature execution of the code by undefining the variable assigned to, or assigning another value to the variable.

end only takes one argument, a code reference. If one wishes the code reference to take arguments, wrapping the code reference in a closure suffices.

Due to a bug in Perl 5.6.0 (and perhaps before), anonymous subroutines that are not a closure will not go out of scope, not even on program termination. That is why end wraps the code fragment in a closure.

There is a second bug in Perl 5.6.0 (and perhaps before) why this is necessary. If the code fragment isn't wrapped in another code reference, the original subroutine will be blessed in the package, making that ref on that code no longer returns the right value.

The current sources of this module are found on github, git://github.com/Abigail/end.git.

This package was written by Abigail, mailto:cpan@abigail.be

Copyright (C) 2000 - 2009, Abigail

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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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