in reply to Re: Redefining function after fork
in thread Redefining function after fork

Thank you. This is what I wanted. However, I also need to do such "remapping" of functions within a child for a set of functions, where each remapping is exactly the same - ideally something like:
foreach my $origName (qw(foo bar baz)) {
    my $newName = "modified_$origName";
    sub $newName {
        print "modified $newName(" . join(',', @_) . ")\n";
    }
    *$origName = *$newName;
}

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However, this is not lexically correct. How does one create a subroutine whos name is a variable?

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Re^3: Redefining function after fork
by AnomalousMonk (Archbishop) on Jan 18, 2014 at 18:32 UTC

    I'm not sure just what you're asking for here, but maybe one of these will serve: 

    >perl -wMstrict -le
"foreach my $origName (qw(foo bar baz)) {
   my $newName = qq{gen_$origName};
   my $newCode = sub {
     print qq{generated $origName(@_)};
     };
   no strict 'refs';
   *$newName = $newCode;
   }
 ;;
 gen_foo(1, 2, 3);
 gen_bar(4, 5, 6);
 gen_baz(7, 8, 9);
 ;;
 my $name = 'also_works';
 eval qq{sub $name { print qq{this also works: \@_}; } };
 also_works(9, 8, 7);
"
generated foo(1 2 3)
generated bar(4 5 6)
generated baz(7 8 9)
this also works: 9 8 7

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    Update: This can be made a bit more concise (note the slightly tricky disambiguating semicolon in the
        *{; ... } = sub { ... }
    statement): 

    >perl -wMstrict -le
"foreach my $origName (qw(foo bar)) {
   no strict 'refs';
   *{; qq{gen_$origName} } = sub { print qq{generated $origName(@_)} }
+;
   }
 ;;
 gen_foo(1, 2, 3);
 gen_bar(4, 5, 6);
"
generated foo(1 2 3)
generated bar(4 5 6)

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      Many thanks! This is exactly what I was looking for.
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