1 files changed, 91 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/_include/auto/at.hpp b/src/boost/libs/hana/test/_include/auto/at.hpp
new file mode 100644
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--- /dev/null
+++ b/src/boost/libs/hana/test/_include/auto/at.hpp
@@ -0,0 +1,91 @@
+// 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_AT_HPP
+#define BOOST_HANA_TEST_AUTO_AT_HPP
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/at.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/integral_constant.hpp>
+
+#include "test_case.hpp"
+#include <laws/base.hpp>
+#include <support/tracked.hpp>
+
+
+namespace _test_at_detail { template <int> struct invalid { }; }
+
+
+TestCase test_at{[]{
+    namespace hana = boost::hana;
+    using hana::test::ct_eq;
+    using _test_at_detail::invalid;
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
+        ct_eq<0>{}
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(ct_eq<0>{}, invalid<1>{}), hana::size_c<0>),
+        ct_eq<0>{}
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}), hana::size_c<1>),
+        ct_eq<1>{}
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}, invalid<2>{}), hana::size_c<1>),
+        ct_eq<1>{}
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}), hana::size_c<2>),
+        ct_eq<2>{}
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}, invalid<3>{}), hana::size_c<2>),
+        ct_eq<2>{}
+    ));
+
+#ifndef MAKE_TUPLE_NO_CONSTEXPR
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1), hana::size_c<0>),
+        1
+    ), "");
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1, '2'), hana::size_c<0>),
+        1
+    ), "");
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<0>),
+        1
+    ), "");
+
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1, '2'), hana::size_c<1>),
+        '2'
+    ), "");
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<1>),
+        '2'
+    ), "");
+
+    static_assert(hana::equal(
+        hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<2>),
+        3.3
+    ), "");
+#endif
+
+    // make sure we can use non-pods on both sides
+    {
+        // store the result to make sure `at` is executed.
+        auto result = hana::at(MAKE_TUPLE(Tracked{0}, ct_eq<1>{}, Tracked{1}), hana::size_c<1>);;
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(result, ct_eq<1>{}));
+    }
+
+}};
+
+#endif // !BOOST_HANA_TEST_AUTO_AT_HPP