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