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Creating Nested Functions

by ikegami (Pope)
on Jul 10, 2008 at 01:42 UTC ( #696592=perltutorial: print w/ replies, xml ) Need Help??

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  1. or download this
    use strict;
    use warnings;
    ...
    
       inner();
    }
    
  2. or download this
    >perl -c test.pl
    Variable "$foo" will not stay shared at test.pl line 8.
    test.pl syntax OK
    
  3. or download this
    use strict;
    use warnings;
    ...
    
       $inner->();
    }
    
  4. or download this
    >perl -c test.pl
    test.pl syntax OK
    
  5. or download this
    use strict;
    use warnings;
    ...
          $inner->()
       }
    }
    
  6. or download this
    Global symbol "$inner" requires explicit package name at test.pl line 
    +6.
    test.pl had compilation errors.
    
  7. or download this
    use strict;
    use warnings;
    ...
          $inner->()
       }
    }
    
  8. or download this
    >perl -c test.pl
    test.pl syntax OK
    
  9. or download this
    # ReleaseTracker.pm
    
    ...
    sub o { ReleaseTracker->new(); }
    
    1;
    
  10. or download this
    use strict;
    use warnings;
    ...
    outer( o() );
    
    END { print("On program exit:\n"); }
    
  11. or download this
    >perl test.pl
    On program exit:
    Destroyed           <--- BAD!
    
  12. or download this
    use strict;
    use warnings;
    ...
    outer( o() );
    
    END { print("On program exit:\n"); }
    
  13. or download this
    >perl test.pl
    Destroyed
    On program exit:
                        <-- good
    
  14. or download this
    sub outer {
       ...
    ...
       };
       helper(@_);
    }
    
  15. or download this
    sub outer {
       ...
    ...
          }
       } )->(@_);
    }
    
  16. or download this
    sub outer {
       ...
    ...
       weaken($helper);
       $helper->(@_);
    }
    

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