libcxx initial import

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/test_hash.h

@@ -0,0 +1,23 @@
+#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