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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)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/tuple.hpp>
- #include <string>
- namespace hana = boost::hana;
- struct Empty { };
- int main() {
- {
- using T = hana::tuple<int>;
- const T t(3);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 3);
- }
- {
- using T = hana::tuple<std::string, int>;
- const T t("high", 5);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == "high");
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 5);
- }
- {
- using T = hana::tuple<double, int>;
- constexpr T t(2.718, 5);
- static_assert(hana::at_c<0>(t) == 2.718, "");
- static_assert(hana::at_c<1>(t) == 5, "");
- }
- {
- using T = hana::tuple<Empty>;
- constexpr T t{Empty()};
- constexpr Empty e = hana::at_c<0>(t); (void)e;
- }
- {
- using T = hana::tuple<double&, std::string, int>;
- double d = 1.5;
- const T t(d, "high", 5);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 1.5);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == "high");
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 5);
- hana::at_c<0>(t) = 2.5;
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2.5);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == "high");
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 5);
- BOOST_HANA_RUNTIME_CHECK(d == 2.5);
- }
- }
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