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Diffstat (limited to 'src/boost/libs/hana/test/_include/auto/for_each.hpp')
-rw-r--r-- | src/boost/libs/hana/test/_include/auto/for_each.hpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/_include/auto/for_each.hpp b/src/boost/libs/hana/test/_include/auto/for_each.hpp new file mode 100644 index 000000000..4e36e9853 --- /dev/null +++ b/src/boost/libs/hana/test/_include/auto/for_each.hpp @@ -0,0 +1,64 @@ +// 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 |