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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
//
//===----------------------------------------------------------------------===//
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
// UNSUPPORTED: 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;
#if TEST_STD_VER <= 17
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()));
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;
}
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