I'm "seriously comlaining" that local is another form of global, no matter which namespace.

There is no big point for using nested subs if they are not completely encapsulated and might interfere with external names, which you might not be able to control.

IMHO safer alternatives are: 

# No Namespace Confusion!

$\="\n";
sub inner { print "global_inner" }
inner();

sub whatever { inner() }


sub outer {
  {
    package outer;
    local *inner=sub {print "inner_of_outer"};
    inner();
  }
  whatever();
}

outer();


__END__
global_inner
inner_of_outer
global_inner

[download]

or 

# No Memory Leak!

$\="\n";
my $inner=sub { print "global_inner" };
$inner->();

sub whatever { $inner->() }


{ 
  my $inner;

  sub outer {
    $inner=sub {print "inner_of_outer"};
    $inner->();
    whatever();
  }
}

outer();


__END__
global_inner
inner_of_outer
global_inner

[download]
I prefere the latter! Unless you plan to call outer() recursively *... ; )

Good night! Rolf

UPDATE: (*) and if you really want to do it, you have to simulate the mechanism of local for lexicals, by starting outer() with push @stack,$inner; and ending it with $inner=shift @stack

In reply to Re^6: sub fuction inside sub functioin? by LanX
in thread sub fuction inside sub functioin? by deewanagan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.