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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