I had a little library which supported a number of
interfaces: procedural, class-based and object-based.
The _shift_self function called as
my $self = &_shift_self looks
at the caller's @_ and Does-What-I-Mean, possibly
shifting the first arg or returning a class name.
A bigger example will follow.
package MyClass;
use Scalar::Util qw(blessed);
sub _shift_self {
if(!defined $_[0]) {
return __PACKAGE__;
} elsif(blessed $_[0]
&& $_[0]->isa(__PACKAGE__) ) {
return shift;
} elsif ( $_[0] =~ /^[_a-zA-Z][\w:']*$/ # Legit package names
&& $_[0]->isa(__PACKAGE__) ) {
# should it be UNIVERSAL::isa($_[0],__PACKAGE); ??
return shift;
} else {
return __PACKAGE__;
}
}
sub new {
my $self = &_shift_self;
my $class = ref $self || $self;
return bless [1], $class;
}
sub dump_self {
my $self = &_shift_self;
print '$self is <',Dumper($self), '> ';
$self->do_something(@_);
}
