275     optional<T> obj2('a');  in test_swap_function()  local
279     swap(obj2, obj2);  in test_swap_function()
281     BOOST_TEST(!!obj2 && obj2->data == 'a');  in test_swap_function()
284     swap(obj1, obj2);  in test_swap_function()
288     BOOST_TEST(!obj2);  in test_swap_function()
291     swap(obj1, obj2);  in test_swap_function()
295     BOOST_TEST(!!obj2 && obj2->data == 'a');  in test_swap_function()
315     optional<T> obj2('a');  in test_swap_member_function()  local
319     obj2.swap(obj2);  in test_swap_member_function()
321     BOOST_TEST(!!obj2 && obj2->data == 'a');  in test_swap_member_function()
324     obj1.swap(obj2);  in test_swap_member_function()
328     BOOST_TEST(!obj2);  in test_swap_member_function()
331     obj1.swap(obj2);  in test_swap_member_function()
335     BOOST_TEST(!!obj2 && obj2->data == 'a');  in test_swap_member_function()