1 files changed, 60 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/map/at_key.cpp b/src/boost/libs/hana/test/map/at_key.cpp
new file mode 100644
index 000000000..c948216cb
--- /dev/null
+++ b/src/boost/libs/hana/test/map/at_key.cpp
@@ -0,0 +1,60 @@
+// 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/equal.hpp>
+#include <boost/hana/map.hpp>
+
+#include <laws/base.hpp>
+#include <support/minimal_product.hpp>
+
+#include <utility>
+namespace hana = boost::hana;
+
+
+template <int i>
+auto key() { return hana::test::ct_eq<i>{}; }
+
+template <int i>
+auto val() { return hana::test::ct_eq<-i>{}; }
+
+template <int i, int j>
+auto p() { return ::minimal_product(key<i>(), val<j>()); }
+
+int main() {
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>()), key<0>()),
+        val<0>()
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>(), p<1,1>()), key<0>()),
+        val<0>()
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>(), p<1,1>()), key<1>()),
+        val<1>()
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<0>()),
+        val<0>()
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<1>()),
+        val<1>()
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<2>()),
+        val<2>()
+    ));
+
+    // check operators
+    auto m = hana::make_map(p<2, 2>(), p<1, 1>());
+    auto const const_m = hana::make_map(p<2, 2>(), p<1, 1>());
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(m[key<1>()], val<1>()));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(const_m[key<1>()], val<1>()));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(std::move(m)[key<1>()], val<1>()));
+}