Probably just never assumed to be used this way. Do not see to much
documentation on using the Symbol table directly. Here is something strange
as well. Try copying a package and then creating an object from it . . .
Really funky
Think I might post this to the p5p list
-----------------------------------------------------
#!/usr/bin/perl -w
#
## ASSIGN TEST TO TEST2
*{ 'Test2::' } = *{ 'Test::' };
## LETS CREATE SOME OBJECTS
my $obj = Test->new;
print 'TEST PACKAGE OBJECT : ', ref($obj), "\n\n";
my $obj2 = Test2->new;
print 'TEST2 PACKAGE OBJECT : ', ref($obj2), "\n\n";
## FYI
print '- ' x 10, 'TEST', ' -' x 10, "\n";
print map { "$_ - $Test::{$_}\n" } keys %Test:: ;
print '- ' x 10, 'TEST2', ' -' x 10, "\n";
print map { "$_ - $Test2::{$_}\n" } keys %Test:: ;
BEGIN {
package Test;
sub new {
my $class =shift;
print "SETTING OBJECT TO CLASS : $class\n";
bless my $obj = {}, $class;
}
}
-------------------------------------------------------
> > > NewPackage will then contain all things in TestPackage....
> >>
> >> Then you can redefined everything in TestPackage without affecting
> >> anything in NewPackage.
> >
> >Actually it will, if you were to delete NewPackage, TestPackage would not
> >contain anything. Modifying 'thingys' in TestPackage would modify
> >NewPackage.
>
> Actually I investigated this a little more and discovered some
> strange things...
>
> If you check out the results, copying the package at the package
> level cause scalars to be redefined and subroutines to created as
> references. Where as copying the the package at the glob level
> caused the the subroutines to be redefined and the scalars to be
> references...
>
> I wonder if this is a problem with perl?
>
> Robert Landrum
> --- results ---
>
> # perl n.pl 1
> NewPackage::x was defined
> NewPackage::june was defined
>
> $NewPackage::x was set to 100
> $Test::x now contains 100
>
> Now Deleting Test package
> Test::x was deleted from the STASH
> Test::june was deleted from the STASH
>
> $NewPackage::x was set to 100
> $Test::x now contains 100
>
> Now Listing NewPackage
> NewPackage::x
> NewPackage::june
>
> Now Listing Test
>
> # perl n.pl
> NewPackage:: was defined as *{Test::}
>
> $NewPackage::x was set to 100
> $Test::x now contains 1
>
> Now Deleting Test package
> Test::x was deleted from the STASH
> Test::june was deleted from the STASH
>
> $NewPackage::x was set to 100
> $Test::x now contains 1
>
> Now Listing NewPackage
>
> Now Listing Test
>
>
>
> --- Contents of n.pl ---
> #!/usr/bin/perl
> package Test;
>
> our $x = 1;
> sub june {
>
> }
>
> package main;
>
> if($ARGV[0]) {
> for my $name (keys %{Test::}) {
> *{"NewPackage::".$name} = *{"Test::".$name};
> print "NewPackage::".$name." was defined\n";
> }
> print "\n";
> } else {
> *{NewPackage::} = *{Test::};
> print "NewPackage:: was defined as \*{Test::}\n";
> print "\n";
> }
> $NewPackage::x = 100;
>
> print "\$NewPackage::x was set to $NewPackage::x\n";
> print "\$Test::x now contains $Test::x\n";
> print "\n";
> print "Now Deleting Test package\n";
> for my $name (keys %{Test::}) {
> delete $Test::{$name};
> print "Test::".$name." was deleted from the STASH\n";
> }
> print "\n";
>
> print "\$NewPackage::x was set to $NewPackage::x\n";
> print "\$Test::x now contains $Test::x\n";
> print "\n";
> print "Now Listing NewPackage\n";
> for my $name (keys %{NewPackage::}) {
> print "NewPackage::".$name."\n";
> }
> print "\n";
> print "Now Listing Test\n";
> for my $name (keys %{Test::}) {
> print "Test::".$name."\n";
> }
> print "\n";
>
