| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11 |
| |
| // <functional> |
| |
| // make sure that we can hash enumeration values |
| // Not very portable |
| |
| #include "test_macros.h" |
| |
| #include <functional> |
| #include <cassert> |
| #include <type_traits> |
| #include <limits> |
| |
| enum class Colors { red, orange, yellow, green, blue, indigo, violet }; |
| enum class Cardinals { zero, one, two, three, five=5 }; |
| enum class LongColors : short { red, orange, yellow, green, blue, indigo, violet }; |
| enum class ShortColors : long { red, orange, yellow, green, blue, indigo, violet }; |
| enum class EightBitColors : uint8_t { red, orange, yellow, green, blue, indigo, violet }; |
| |
| enum Fruits { apple, pear, grape, mango, cantaloupe }; |
| |
| 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())); |
| typedef typename std::underlying_type<T>::type under_type; |
| |
| H h1; |
| std::hash<under_type> h2; |
| for (int i = 0; i <= 5; ++i) |
| { |
| T t(static_cast<T> (i)); |
| const bool small = std::integral_constant<bool, sizeof(T) <= sizeof(std::size_t)>::value; // avoid compiler warnings |
| if (small) |
| assert(h1(t) == h2(static_cast<under_type>(i))); |
| } |
| } |
| |
| int main(int, char**) |
| { |
| test<Cardinals>(); |
| |
| test<Colors>(); |
| test<ShortColors>(); |
| test<LongColors>(); |
| test<EightBitColors>(); |
| |
| test<Fruits>(); |
| |
| return 0; |
| } |