{

int val;

BOOST_CONSTEXPR explicit Value(int v) : val(v) {}

{

int val;

BOOST_CONSTEXPR explicit Guard(int v) : val(v) {}

{

Tref v1 (1), v2 (2);

optional<Tref&> opt_ref0;

optional<Tref&> opt_ref1 (v1);

optional<Tval> opt_val0 (opt_ref0);

optional<Tval> opt_val1 (opt_ref1);

optional<Tval> opt_val2 (make_opt_ref(v2));

BOOST_TEST (!opt_val0);

BOOST_TEST (opt_val1);

BOOST_TEST (opt_val2);

BOOST_TEST_EQ (1, val(*opt_val1));

BOOST_TEST_EQ (2, val(*opt_val2));

BOOST_TEST (boost::addressof(*opt_val1) != boost::addressof(v1));

BOOST_TEST (boost::addressof(*opt_val2) != boost::addressof(v2));

{

Tref v1 (1), v2 (2);

optional<Tref&> opt_ref0;

optional<Tref&> opt_ref1 (v1);

optional<Tval> opt_val0;

optional<Tval> opt_val1;

optional<Tval> opt_val2;

opt_val0 = opt_ref0;

opt_val1 = opt_ref1;

opt_val2 = make_opt_ref(v2);

BOOST_TEST (!opt_val0);

BOOST_TEST (opt_val1);

BOOST_TEST (opt_val2);

BOOST_TEST_EQ (1, val(*opt_val1));

BOOST_TEST_EQ (2, val(*opt_val2));

BOOST_TEST (boost::addressof(*opt_val1) != boost::addressof(v1));

BOOST_TEST (boost::addressof(*opt_val2) != boost::addressof(v2));

{

#ifdef BOOST_OPTIONAL_USES_UNION_IMPLEMENTATION

using boost::optional;

using boost::in_place_init;

{ // optional<T>& -> optional<T&>

optional<T> ovN, ov1(in_place_init, 1), ov2(in_place_init, 2);

optional<T&> orN = ovN;

optional<T&> or1 = ov1;

optional<T&> or2 = ov2;

BOOST_TEST_EQ (!!orN, !!ovN);

BOOST_TEST_EQ (!!or1, !!ov1);

BOOST_TEST_EQ (!!or2, !!ov2);

BOOST_TEST (or1);

BOOST_TEST (or2);

BOOST_TEST_EQ (val(*or1), 1);

BOOST_TEST_EQ (val(*or2), 2);

BOOST_TEST (boost::addressof(*or1) == boost::addressof(*ov1));

BOOST_TEST (boost::addressof(*or2) == boost::addressof(*ov2));

}

{ // const optional<T>& -> optional<const T&>

constexpr optional<T> ovN;

constexpr optional<T> ov1(in_place_init, 1);

constexpr optional<T> ov2(in_place_init, 2);

optional<const T&> orN = ovN;

optional<const T&> or1 = ov1;

optional<const T&> or2 = ov2;

BOOST_TEST_EQ (!!orN, !!ovN);

BOOST_TEST_EQ (!!or1, !!ov1);

BOOST_TEST_EQ (!!or2, !!ov2);

BOOST_TEST (or1);

BOOST_TEST (or2);

BOOST_TEST_EQ (val(*or1), 1);

BOOST_TEST_EQ (val(*or2), 2);

BOOST_TEST (boost::addressof(*or1) == boost::addressof(*ov1));

BOOST_TEST (boost::addressof(*or2) == boost::addressof(*ov2));

}

{ // optional<const T>& -> optional<const T&>

optional<const T> ovN;

optional<const T> ov1(in_place_init, 1);

optional<const T> ov2(in_place_init, 2);

optional<const T&> orN = ovN;

optional<const T&> or1 = ov1;

optional<const T&> or2 = ov2;

BOOST_TEST_EQ (!!orN, !!ovN);

BOOST_TEST_EQ (!!or1, !!ov1);

BOOST_TEST_EQ (!!or2, !!ov2);

BOOST_TEST (or1);

BOOST_TEST (or2);

BOOST_TEST_EQ (val(*or1), 1);

BOOST_TEST_EQ (val(*or2), 2);

BOOST_TEST (boost::addressof(*or1) == boost::addressof(*ov1));

BOOST_TEST (boost::addressof(*or2) == boost::addressof(*ov2));

}

{ // optional<T>& -> optional<const T&>

optional<T> ovN;

optional<T> ov1(in_place_init, 1);

optional<T> ov2(in_place_init, 2);

optional<const T&> orN = ovN;

optional<const T&> or1 = ov1;

optional<const T&> or2 = ov2;

BOOST_TEST_EQ (!!orN, !!ovN);

BOOST_TEST_EQ (!!or1, !!ov1);

BOOST_TEST_EQ (!!or2, !!ov2);

BOOST_TEST (or1);

BOOST_TEST (or2);

BOOST_TEST_EQ (val(*or1), 1);

BOOST_TEST_EQ (val(*or2), 2);

BOOST_TEST (boost::addressof(*or1) == boost::addressof(*ov1));

BOOST_TEST (boost::addressof(*or2) == boost::addressof(*ov2));

}

#endif // BOOST_OPTIONAL_USES_UNION_IMPLEMENTATION

{

test_construct_from_optional_ref<int, int>();

test_construct_from_optional_ref<int, int const>();

test_construct_from_optional_ref<int const, int const>();

test_construct_from_optional_ref<int const, int>();

test_construct_from_optional_ref<Value, Value>();

test_construct_from_optional_ref<Value, Value const>();

test_construct_from_optional_ref<Value const, Value const>();

test_construct_from_optional_ref<Value const, Value>();

test_assign_from_optional_ref<int, int>();

test_assign_from_optional_ref<int, int const>();

test_assign_from_optional_ref<Value, Value>();

test_assign_from_optional_ref<Value, Value const>();

test_convert_optional_T_to_optional_T_ref<int>();

test_convert_optional_T_to_optional_T_ref<Value>();

test_convert_optional_T_to_optional_T_ref<Guard>();

return boost::report_errors();