| … | |
… | |
| 10 | # to go back to "/" no matter how myfun exits: |
10 | # to go back to "/" no matter how myfun exits: |
| 11 | sub myfun { |
11 | sub myfun { |
| 12 | scope_guard { chdir "/" }; |
12 | scope_guard { chdir "/" }; |
| 13 | chdir "/etc"; |
13 | chdir "/etc"; |
| 14 | |
14 | |
| 15 | call_function_that_might_die_or_other_fun_stuff; |
15 | code_that_might_die_or_does_other_fun_stuff; |
| 16 | } |
16 | } |
| 17 | |
17 | |
| 18 | =head1 DESCRIPTION |
18 | =head1 DESCRIPTION |
| 19 | |
19 | |
| 20 | This module implements so-called "guards". A guard is something (usually |
20 | This module implements so-called "guards". A guard is something (usually |
| … | |
… | |
| 37 | package Guard; |
37 | package Guard; |
| 38 | |
38 | |
| 39 | no warnings; |
39 | no warnings; |
| 40 | |
40 | |
| 41 | BEGIN { |
41 | BEGIN { |
| 42 | $VERSION = '0.5'; |
42 | $VERSION = '1.01'; |
| 43 | @ISA = qw(Exporter); |
43 | @ISA = qw(Exporter); |
| 44 | @EXPORT = qw(guard scope_guard); |
44 | @EXPORT = qw(guard scope_guard); |
| 45 | |
45 | |
| 46 | require Exporter; |
46 | require Exporter; |
| 47 | |
47 | |
| … | |
… | |
| 189 | =head1 THANKS |
189 | =head1 THANKS |
| 190 | |
190 | |
| 191 | Thanks to Marco Maisenhelder, who reminded me of the C<$Guard::DIED> |
191 | Thanks to Marco Maisenhelder, who reminded me of the C<$Guard::DIED> |
| 192 | solution to the problem of exceptions. |
192 | solution to the problem of exceptions. |
| 193 | |
193 | |
|
|
194 | =head1 SEE ALSO |
|
|
195 | |
|
|
196 | L<Scope::Guard> and L<Sub::ScopeFinalizer>, which actually implement |
|
|
197 | dynamic, not scoped guards, and have a lot higher CPU, memory and typing |
|
|
198 | overhead. |
|
|
199 | |
|
|
200 | L<Hook::Scope>, which has apparently never been finished and corrupts |
|
|
201 | memory when used. |
|
|
202 | |
| 194 | =cut |
203 | =cut |
| 195 | |
204 | |
