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