| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // : public unary_function<T, size_t> |
| // { |
| // 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; |
| static_assert((std::is_same<typename H::argument_type, T>::value), "" ); |
| static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); |
| 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 |
| #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS |
| test<std::u16string>(); |
| test<std::u32string>(); |
| #endif // _LIBCPP_HAS_NO_UNICODE_CHARS |
| test<std::wstring>(); |
| |
| return 0; |
| } |