1 files changed, 55 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/concept/struct/at_key.cpp b/src/boost/libs/hana/test/concept/struct/at_key.cpp
new file mode 100644
index 000000000..2a9d757be
--- /dev/null
+++ b/src/boost/libs/hana/test/concept/struct/at_key.cpp
@@ -0,0 +1,55 @@
+// 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/at_key.hpp>
+#include <boost/hana/define_struct.hpp>
+#include <boost/hana/string.hpp>
+
+#include <string>
+namespace hana = boost::hana;
+
+
+struct Person {
+    BOOST_HANA_DEFINE_STRUCT(Person,
+        (std::string, name),
+        (std::string, last_name),
+        (int, age)
+    );
+};
+
+int main() {
+    // non-const ref
+    {
+        Person john{"John", "Doe", 30};
+        std::string& name = hana::at_key(john, BOOST_HANA_STRING("name"));
+        std::string& last_name = hana::at_key(john, BOOST_HANA_STRING("last_name"));
+        int& age = hana::at_key(john, BOOST_HANA_STRING("age"));
+
+        name = "Bob";
+        last_name = "Foo";
+        age = 99;
+
+        BOOST_HANA_RUNTIME_CHECK(john.name == "Bob");
+        BOOST_HANA_RUNTIME_CHECK(john.last_name == "Foo");
+        BOOST_HANA_RUNTIME_CHECK(john.age == 99);
+    }
+
+    // const ref
+    {
+        Person john{"John", "Doe", 30};
+        Person const& const_john = john;
+        std::string const& name = hana::at_key(const_john, BOOST_HANA_STRING("name"));
+        std::string const& last_name = hana::at_key(const_john, BOOST_HANA_STRING("last_name"));
+        int const& age = hana::at_key(const_john, BOOST_HANA_STRING("age"));
+
+        john.name = "Bob";
+        john.last_name = "Foo";
+        john.age = 99;
+
+        BOOST_HANA_RUNTIME_CHECK(name == "Bob");
+        BOOST_HANA_RUNTIME_CHECK(last_name == "Foo");
+        BOOST_HANA_RUNTIME_CHECK(age == 99);
+    }
+}