1 files changed, 27 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/at_key.cpp b/src/boost/libs/hana/example/at_key.cpp
new file mode 100644
index 000000000..41f29b573
--- /dev/null
+++ b/src/boost/libs/hana/example/at_key.cpp
@@ -0,0 +1,27 @@
+// 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/integral_constant.hpp>
+#include <boost/hana/map.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/type.hpp>
+
+#include <string>
+namespace hana = boost::hana;
+
+
+int main() {
+    auto m = hana::make_map(
+        hana::make_pair(hana::type<int>{}, std::string{"int"}),
+        hana::make_pair(hana::int_<3>{}, std::string{"3"})
+    );
+
+    BOOST_HANA_RUNTIME_CHECK(hana::at_key(m, hana::type<int>{}) == "int");
+
+    // usage as operator[]
+    BOOST_HANA_RUNTIME_CHECK(m[hana::type<int>{}] == "int");
+    BOOST_HANA_RUNTIME_CHECK(m[hana::int_<3>{}] == "3");
+}