1 files changed, 32 insertions, 0 deletions
diff --git a/libcxx/test/std/containers/test_hash.h b/libcxx/test/std/containers/test_hash.h
new file mode 100644
index 00000000000..1a70e7cbdd9
--- /dev/null
+++ b/libcxx/test/std/containers/test_hash.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_HASH_H
+#define TEST_HASH_H
+
+#include <cstddef>
+#include <type_traits>
+
+template <class C>
+class test_hash
+    : private C
+{
+    int data_;
+public:
+    explicit test_hash(int data = 0) : data_(data) {}
+
+    std::size_t
+    operator()(typename std::add_lvalue_reference<const typename C::argument_type>::type x) const
+        {return C::operator()(x);}
+
+    bool operator==(const test_hash& c) const
+        {return data_ == c.data_;}
+};
+
+#endif  // TEST_HASH_H