I discussed this with several people at YAPC last year -- I think I even talked to Larry about it. You can't localize a function, and undefing it leaves a broken stub. There were several approaches I could think of:
- Create a fake class
my $x = SubClass->new; # inherits from SuperClass
$x->method; # calls SubClass::method
{
local @FAKE::ISA = @{ ref($x) . "::ISA" };
$x->FAKE::method; # calls SuperClass::method
}
$x->method; # calls SubClass::method
- localize the glob, and restore all but the code
my $x = SubClass->new; # inherits from SuperClass
$x->method; # calls SubClass::method
{
# save the glob...
local *old = *{ ref($x) . "::method" };
# localize the glob...
local *{ ref($x) . "::method" };
# and restore everything else
${ ref($x) . "::method" } = $old;
@{ ref($x) . "::method" } = @old;
%{ ref($x) . "::method" } = %old;
# technically incomplete
$x->method; # calls SuperClass::method
}
$x->method; # calls SubClass::method
- icky eval + SUPER:: hack -- the SUPER:: doesn't work if you're not physically in the package!
my $x = SubClass->new; # inherits from SuperClass
$x->method; # calls SubClass::method
{
my $pkg = ref $x;
eval qq{
package $pkg;
\$x->SUPER::method; # calls SuperClass::method
};
}
$x->method; # calls SubClass::method
These are gross. That's why I want to be able to say:
local &foo;
japhy --
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