also handle undef inputs

diff --git a/lib/Safe/Isa.pm b/lib/Safe/Isa.pm
index 2d6c675..7155c84 100644 (file)
--- a/lib/Safe/Isa.pm
+++ b/lib/Safe/Isa.pm
@@ -17,7 +17,7 @@ our $_call_if_object = sub {
 
 our $_call_if_object_or_classname = sub {
   my ($thing, $method) = (shift, shift);
-  return unless blessed($thing) or do {
+  return unless blessed($thing) or defined($thing) and do {
     no strict 'refs';
     %{"main::${thing}::"}
   };

diff --git a/t/safe_isa.t b/t/safe_isa.t
index 0fa9d37..54e57c3 100644 (file)
--- a/t/safe_isa.t
+++ b/t/safe_isa.t
@@ -10,6 +10,7 @@ my $bar = Bar->new;
 my $blam = [ 42 ];
 my $class = 'Bar';
 my $blam2 = '';
+my $undef;
 
 # basic isa usage -
 
@@ -18,12 +19,14 @@ ok($bar->isa('Foo'), 'bar isa Foo');
 ok($class->isa('Foo'), 'class name isa Foo');
 ok(!eval { $blam->isa('Foo'); 1 }, 'blam goes blam with isa');
 ok(!eval { $blam2->isa('Foo'); 1 }, 'blam2 goes blam with isa');
+ok(!eval { $undef->isa('Foo'); 1 }, 'undef goes blam with isa');
 
 ok(!$foo->can('bar'), 'foo !can bar');
 ok($bar->can('bar'), 'bar can bar');
 ok($class->can('bar'), 'our class name can bar');
 ok(!eval { $blam->can('bar'); 1 }, 'blam goes blam with can');
 ok(!eval { $blam2->can('bar'); 1 }, 'blam2 goes blam with can');
+ok(!eval { $undef->can('bar'); 1 }, 'undef goes blam with can');
 
 use Safe::Isa;
 
@@ -32,12 +35,14 @@ ok($bar->$_isa('Foo'), 'bar $_isa Foo');
 ok($class->$_isa('Foo'), 'class name $_isa Foo');
 ok(eval { $blam->$_isa('Foo'); 1 }, 'no boom today with isa');
 ok(eval { $blam2->$_isa('Foo'); 1 }, 'no boom today with isa');
+ok(eval { $undef->$_isa('Foo'); 1 }, 'no boom today with isa');
 
 ok(!$foo->$_can('bar'), 'foo !$_can bar');
 ok($bar->$_can('bar'), 'bar $_can bar');
 ok($class->$_can('bar'), 'class name $_can bar');
 ok(eval { $blam->$_can('bar'); 1 }, 'no boom today with can');
 ok(eval { $blam2->$_can('bar'); 1 }, 'no boom today with can');
+ok(eval { $undef->$_can('bar'); 1 }, 'no boom today with can');
 
 ok($foo->$_call_if_object(isa => 'Foo'), 'foo $_call_if_object(isa => Foo)');
 ok($bar->$_call_if_object(isa => 'Foo'), 'bar $_call_if_object(isa => Foo)');
@@ -48,3 +53,4 @@ ok($bar->$_call_if_object_or_classname(isa => 'Foo'), 'bar $_call_if_object_or_c
 ok($class->$_call_if_object_or_classname(isa => 'Foo'), 'class name $_call_if_object_or_classname(isa => Foo)');
 ok(eval { $blam->$_call_if_object_or_classname(isa => 'Foo'); 1 }, 'no boom today with _call_if_object_or_classname');
 ok(eval { $blam2->$_call_if_object_or_classname(isa => 'Foo'); 1 }, 'no boom today with _call_if_object_or_classname');
+ok(eval { $undef->$_call_if_object_or_classname(isa => 'Foo'); 1 }, 'no boom today with _call_if_object_or_classname');