Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I'm no expert on Safe but I believe this to be a namespace problem. I played with your code and produced:
use strict; use Safe; my $CODE = << 'END'; package A; sub new { my($class) = @_; print "hi there"; bless { }, $class; } package B; @ISA = qw(ROOT::A); END # If I uncomment this line, everything works. # eval $CODE; my $safe = Safe->new('ROOT'); $safe->reval($CODE); warn "code - $@" if $@; ROOT::B->new(); warn "new - $@" if $@;

Which prints the 'hi there' message. I don't think this is what you want, however. If you are wanting to load code and run it (from packages) then I would keep the package code in separate files and do the loading, run-time evaluation in the Safe compartment.

Now a disclaimer, this is how I do it but I don't know if there are any issues with it. I'd appreciate feedback :). If there is something wrong with this method then I've got some work to do on some of my projects :).

My way is slightly more complex cos I use a factory object to load the modules. Here is a stripped down version with that factory code removed.
use strict; use warnings; use Safe; my $despatch = {}; my $code = sub { my $module = "A"; my $mainmodule = $module . ".pm"; require $mainmodule; import $mainmodule; my $obj = $module->new(); $despatch->{"A"} = $obj; $module = "B"; $obj = $module->new(); $despatch->{"$obj"} = $obj; }; my $compartment = Safe->new('testing'); $compartment->reval(&{$code}()); $compartment->reval( $despatch->{'A'}->test() );
I put your module code in a file, called I also added a method:
package A; sub new { my($class) = @_; print "hi there\n"; bless { }, $class; } sub test { print "In test"; } package B; @ISA = qw(A); 1;
I know theres some useless variables (mainmodule etc) but they were all getting set via object methods and config file values so I left them in place.

All the best and I hope this helps.

In reply to Re: Safe / @ISA Problem by simon.proctor
in thread Safe / @ISA Problem by rdw

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

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (4)
As of 2023-03-20 14:53 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (59 votes). Check out past polls.