forked from OSchip/llvm-project
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// make sure that we can hash enumeration values
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// Not very portable
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#include <__config>
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#if _LIBCPP_STD_VER > 11
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#include <functional>
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#include <cassert>
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#include <type_traits>
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#include <limits>
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enum class Colors { red, orange, yellow, green, blue, indigo, violet };
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enum class Cardinals { zero, one, two, three, five=5 };
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enum class LongColors : short { red, orange, yellow, green, blue, indigo, violet };
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enum class ShortColors : long { red, orange, yellow, green, blue, indigo, violet };
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enum class EightBitColors : uint8_t { red, orange, yellow, green, blue, indigo, violet };
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enum Fruits { apple, pear, grape, mango, cantaloupe };
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template <class T>
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void
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test()
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{
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static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
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std::hash<T> >::value), "");
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typedef typename std::underlying_type<T>::type under_type;
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std::hash<T> h1;
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std::hash<under_type> h2;
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for (int i = 0; i <= 5; ++i)
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{
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T t(static_cast<T> (i));
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if (sizeof(T) <= sizeof(std::size_t))
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assert(h1(t) == h2(static_cast<under_type>(i)));
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}
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}
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int main()
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{
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test<Cardinals>();
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test<Colors>();
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test<ShortColors>();
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test<LongColors>();
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test<EightBitColors>();
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test<Fruits>();
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}
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#else
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int main () {}
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#endif
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