'overloading' pragma

1 files changed, 86 insertions, 0 deletions

diff --git a/lib/overloading.t b/lib/overloading.t
new file mode 100644
index 0000000000..8121cc8b41
--- /dev/null
+++ b/lib/overloading.t
@@ -0,0 +1,86 @@
+#./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+}
+
+BEGIN {
+    require "./test.pl";
+    plan(tests => 22);
+}
+
+use Scalar::Util qw(refaddr);
+
+{
+    package Stringifies;
+
+    use overload (
+	fallback => 1,
+	'""' => sub { "foo" },
+	'0+' => sub { 42 },
+    );
+
+    sub new { bless {}, shift };
+}
+
+my $x = Stringifies->new;
+
+is( "$x", "foo", "stringifies" );
+is( 0 + $x, 42, "numifies" );
+
+{
+    no overloading;
+    is( "$x", overload::StrVal($x), "no stringification" );
+    is( 0 + $x, refaddr($x), "no numification" );
+
+    {
+	no overloading '""';
+	is( "$x", overload::StrVal($x), "no stringification" );
+	is( 0 + $x, refaddr($x), "no numification" );
+    }
+}
+
+{
+    no overloading '""';
+
+    is( "$x", overload::StrVal($x), "no stringification" );
+    is( 0 + $x, 42, "numifies" );
+
+    {
+	no overloading;
+	is( "$x", overload::StrVal($x), "no stringification" );
+	is( 0 + $x, refaddr($x), "no numification" );
+    }
+
+    use overloading '""';
+
+    is( "$x", "foo", "stringifies" );
+    is( 0 + $x, 42, "numifies" );
+
+    no overloading '0+';
+    is( "$x", "foo", "stringifies" );
+    is( 0 + $x, refaddr($x), "no numification" );
+
+    {
+	no overloading '""';
+	is( "$x", overload::StrVal($x), "no stringification" );
+	is( 0 + $x, refaddr($x), "no numification" );
+
+	{
+	    use overloading;
+	    is( "$x", "foo", "stringifies" );
+	    is( 0 + $x, 42, "numifies" );
+	}
+    }
+
+    is( "$x", "foo", "stringifies" );
+    is( 0 + $x, refaddr($x), "no numification" );
+
+
+    BEGIN { ok(exists($^H{overloading}), "overloading hint present") }
+
+    use overloading;
+
+    BEGIN { ok(!exists($^H{overloading}), "overloading hint removed") }
+}