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Re: localizing handles with anonymous subroutines

by jmcnamara (Monsignor)
on Jun 10, 2002 at 13:30 UTC ( [id://173118]=note: print w/replies, xml ) Need Help??


in reply to localizing handles with anonymous subroutines


Is there an advantage of this method over do? 
my @files = do {
    local *DH;
    opendir( DH, $dir ) or die 'Cannot open ' . $dir;
    grep { -f $_ } readdir(DH);
};

[download]

--
John.

Replies are listed 'Best First'.
Re^2: localizing handles with anonymous subroutines
by particle (Vicar) on Jun 10, 2002 at 16:13 UTC
    yes, there's a huge advantage. do is not a subroutine. it cannot take parameters. just try to do this!

    my %dispatch = (
  sub_get_files => sub{ # takes one arg
    local *DH;
    opendir( DH, $_[0] ) or die 'Cannot open ' . $_[0];
    return grep { -f $_ } readdir(DH)
  },
);

my @files = $dispatch{sub_get_files}->( $dir );

    [download]
    do executes immediately, and would spit the results into the hash. icky.<p

    ~Particle *accelerates*

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