| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS |
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| 10 | |
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| 11 | // <functional> |
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| 12 | |
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| 13 | // Make sure that we can hash enumeration values. |
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| 14 | |
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| 15 | #include <functional> |
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| 16 | #include <cassert> |
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| 17 | #include <cstddef> |
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| 18 | #include <cstdint> |
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| 19 | #include <limits> |
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| 20 | #include <type_traits> |
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| 21 | |
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| 22 | #include "test_macros.h" |
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| 23 | |
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| 24 | enum class Colors { red, orange, yellow, green, blue, indigo, violet }; |
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| 25 | enum class Cardinals { zero, one, two, three, five=5 }; |
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| 26 | enum class LongColors : short { red, orange, yellow, green, blue, indigo, violet }; |
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| 27 | enum class ShortColors : long { red, orange, yellow, green, blue, indigo, violet }; |
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| 28 | enum class EightBitColors : std::uint8_t { red, orange, yellow, green, blue, indigo, violet }; |
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| 29 | |
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| 30 | enum Fruits { apple, pear, grape, mango, cantaloupe }; |
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| 31 | |
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| 32 | template <class T> |
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| 33 | void |
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| 34 | test() |
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| 35 | { |
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| 36 | typedef std::hash<T> H; |
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| 37 | #if TEST_STD_VER <= 17 |
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| 38 | static_assert((std::is_same<typename H::argument_type, T>::value), "" ); |
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| 39 | static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); |
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| 40 | #endif |
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| 41 | ASSERT_NOEXCEPT(H()(T())); |
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| 42 | typedef typename std::underlying_type<T>::type under_type; |
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| 43 | |
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| 44 | H h1; |
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| 45 | std::hash<under_type> h2; |
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| 46 | for (int i = 0; i <= 5; ++i) |
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| 47 | { |
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| 48 | T t(static_cast<T> (i)); |
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| 49 | const bool small = std::integral_constant<bool, sizeof(T) <= sizeof(std::size_t)>::value; // avoid compiler warnings |
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| 50 | if (small) |
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| 51 | assert(h1(t) == h2(static_cast<under_type>(i))); |
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| 52 | } |
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| 53 | } |
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| 54 | |
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| 55 | int main(int, char**) |
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| 56 | { |
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| 57 | test<Cardinals>(); |
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| 58 | |
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| 59 | test<Colors>(); |
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| 60 | test<ShortColors>(); |
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| 61 | test<LongColors>(); |
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| 62 | test<EightBitColors>(); |
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| 63 | |
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| 64 | test<Fruits>(); |
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| 65 | |
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| 66 | return 0; |
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| 67 | } |
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| 68 | |
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