1End(3)                User Contributed Perl Documentation               End(3)
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NAME

6       End - generalized END {}.
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SYNOPSIS

9           use End;
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11           {  my $foo = end {print "Leaving the block\n"};
12              ...
13              last;    # prints "Leaving the block\n".
14              ...
15           }
16

DESCRIPTION

18       The module "End" exports a single subroutine "end", which allows you to
19       set up some code that is run whenever the current block is exited,
20       regardless whether that is due to a "return", "next", "last", "redo",
21       "exit", "die", "goto" or just reaching the end of the block.
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23       To be more precise, "end" returns an object, that will execute the code
24       when the object is destroyed; that is, when the variable assigned to
25       goes out of scope. If the variable is lexical to the current block, the
26       code will be executed when leaving the block.
27
28       One can force premature execution of the code by undefining the
29       variable assigned to, or assigning another value to the variable.
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31       "end" only takes one argument, a code reference. If one wishes the code
32       reference to take arguments, wrapping the code reference in a closure
33       suffices.
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BUGS

36       Due to a bug in Perl 5.6.0 (and perhaps before), anonymous subroutines
37       that are not a closure will not go out of scope, not even on program
38       termination. That is why "end" wraps the code fragment in a closure.
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40       There is a second bug in Perl 5.6.0 (and perhaps before) why this is
41       necessary. If the code fragment isn't wrapped in another code
42       reference, the original subroutine will be blessed in the package,
43       making that "ref" on that code no longer returns the right value.
44

DEVELOPMENT

46       The current sources of this module are found on github,
47       <git://github.com/Abigail/end.git>.
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AUTHOR

50       This package was written by Abigail, <mailto:cpan@abigail.be>
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53       Copyright (C) 2000 - 2009, Abigail
54
55       Permission is hereby granted, free of charge, to any person obtaining a
56       copy of this software and associated documentation files (the
57       "Software"), to deal in the Software without restriction, including
58       without limitation the rights to use, copy, modify, merge, publish,
59       distribute, sublicense, and/or sell copies of the Software, and to
60       permit persons to whom the Software is furnished to do so, subject to
61       the following conditions:
62
63       The above copyright notice and this permission notice shall be included
64       in all copies or substantial portions of the Software.
65
66       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
67       OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
68       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
69       IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
70       LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
71       FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
72       DEALINGS IN THE SOFTWARE.
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76perl v5.28.0                      2009-11-04                            End(3)
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