Initial commit

module/jni/libcxx/test/std/strings/basic.string.hash/strings.pass.cpp

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+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// template <class T>
+// struct hash
+// {
+//     size_t operator()(T val) const;
+// };
+
+// Not very portable
+
+#include <string>
+#include <cassert>
+#include <type_traits>
+
+#include "test_macros.h"
+
+template <class T>
+void
+test()
+{
+    typedef std::hash<T> H;
+#if TEST_STD_VER <= 14
+    static_assert((std::is_same<typename H::argument_type, T>::value), "" );
+    static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
+#endif
+    ASSERT_NOEXCEPT(H()(T()));
+
+    H h;
+    std::string g1 = "1234567890";
+    std::string g2 = "1234567891";
+    T s1(g1.begin(), g1.end());
+    T s2(g2.begin(), g2.end());
+    assert(h(s1) != h(s2));
+}
+
+int main(int, char**)
+{
+    test<std::string>();
+#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
+    test<std::u8string>();
+#endif
+    test<std::u16string>();
+    test<std::u32string>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+    test<std::wstring>();
+#endif
+
+  return 0;
+}