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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_HANA_TEST_AUTO_FOR_EACH_HPP
- #define BOOST_HANA_TEST_AUTO_FOR_EACH_HPP
- #include <boost/hana/assert.hpp>
- #include <boost/hana/for_each.hpp>
- #include "test_case.hpp"
- #include <laws/base.hpp>
- #include <vector>
- TestCase test_for_each{[]{
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- // Make sure the function is applied in left-to-right order.
- {
- auto check = [](auto ...xs) {
- std::vector<int> seen{};
- hana::for_each(MAKE_TUPLE(xs...), [&](int x) {
- seen.push_back(x);
- });
- BOOST_HANA_RUNTIME_CHECK(seen == std::vector<int>{xs...});
- };
- check();
- check(0);
- check(0, 1);
- check(0, 1, 2);
- check(0, 1, 2, 3);
- check(0, 1, 2, 3, 4);
- }
- // Make sure the function is never called when the sequence is empty.
- {
- struct undefined { };
- hana::for_each(MAKE_TUPLE(), undefined{});
- }
- // Make sure it works with heterogeneous sequences.
- {
- hana::for_each(MAKE_TUPLE(ct_eq<0>{}), [](auto) { });
- hana::for_each(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), [](auto) { });
- hana::for_each(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), [](auto) { });
- hana::for_each(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}), [](auto) { });
- }
- // Make sure for_each is constexpr when used with a constexpr function
- // and constexpr arguments. This used not to be the case.
- #ifndef MAKE_TUPLE_NO_CONSTEXPR
- {
- struct f { constexpr void operator()(int) const { } };
- constexpr int i = (hana::for_each(MAKE_TUPLE(1, 2, 3), f{}), 0);
- (void)i;
- }
- #endif
- }};
- #endif // !BOOST_HANA_TEST_AUTO_FOR_EACH_HPP
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