1 files changed, 44 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp b/libcxx/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp
new file mode 100644
index 00000000000..b1b24f96f90
--- /dev/null
+++ b/libcxx/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp
@@ -0,0 +1,44 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// template <class T>
+// struct hash
+//     : public unary_function<T, size_t>
+// {
+//     size_t operator()(T val) const;
+// };
+
+// Not very portable
+
+#include <bitset>
+#include <cassert>
+#include <type_traits>
+
+template <std::size_t N>
+void
+test()
+{
+    typedef std::bitset<N> T;
+    typedef std::hash<T> H;
+    static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
+                                   H>::value), "");
+    H h;
+    T bs(static_cast<unsigned long long>(N));
+    assert(h(bs) == N);
+}
+
+int main()
+{
+    test<0>();
+    test<10>();
+    test<100>();
+    test<1000>();
+}