| 13 | |
| 14 | |
| 15 | int main() { |
| 16 | auto f = [](auto x) { |
| 17 | return hana::just(hana::test::_injection<0>{}(x)); |
| 18 | }; |
| 19 | |
| 20 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 21 | hana::chain(hana::just(ct_eq<3>{}), f), |
| 22 | f(ct_eq<3>{}) |
| 23 | )); |
| 24 | |
| 25 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 26 | hana::chain(hana::nothing, f), |
| 27 | hana::nothing |
| 28 | )); |
| 29 | |
| 30 | // test with operators |
| 31 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 32 | hana::just(ct_eq<3>{}) | f, |
| 33 | f(ct_eq<3>{}) |
| 34 | )); |
| 35 | |
| 36 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 37 | hana::nothing | f, |
| 38 | hana::nothing |
| 39 | )); |
| 40 | } |