Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

Perhaps copying and restoring the symbol table does what you want?

use Data::Dumper; package Foo; $foo="bar"; sub quux { print "\$foo is '$foo'\n" } package main; my %Foo_save = %Foo::; print "-1-\n",Dumper \%Foo::; eval "\$Foo::bar = q{quux}"; print "-2-\n",Dumper \%Foo::; print "-3-\n",Dumper \%Foo_save; %Foo:: = %Foo_save; print "-4-\n",Dumper \%Foo::; Foo::quux(); eval "print \"but Foo::bar is '\$Foo::bar'\\n\""; __END__ -1- $VAR1 = { 'quux' => *Foo::quux, 'foo' => *Foo::foo }; -2- $VAR1 = { 'bar' => *Foo::bar, 'quux' => *Foo::quux, 'foo' => *Foo::foo }; -3- $VAR1 = { 'quux' => *Foo::quux, 'foo' => *Foo::foo }; -4- $VAR1 = { 'quux' => *Foo::quux, 'foo' => *Foo::foo }; $foo is 'bar' but Foo::bar is ''

That fails if eval'ed code populates a scalar slot of an already present typeglob - if, for instance, the subroutine in Foo was named 'bar', then $Foo::bar would retain the value set in the string eval. Hmm.. maybe Clone would help?


In reply to Re^3: Dynamically Changing Packages w/out Eval by shmem
in thread Dynamically Changing Packages w/out Eval by Ovid

Title:
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?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others studying the Monastery: (3)
As of 2024-06-18 19:20 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?
    erzuuli‥ 🛈The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.