--- /dev/null
+// Copyright Louis Dionne 2013-2016
+// 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);
+ }
+}