diff options
Diffstat (limited to 'test/std/utilities/function.objects/unord.hash/enum.pass.cpp')
-rw-r--r-- | test/std/utilities/function.objects/unord.hash/enum.pass.cpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/test/std/utilities/function.objects/unord.hash/enum.pass.cpp b/test/std/utilities/function.objects/unord.hash/enum.pass.cpp new file mode 100644 index 000000000000..bd92a4ac4d2e --- /dev/null +++ b/test/std/utilities/function.objects/unord.hash/enum.pass.cpp @@ -0,0 +1,62 @@ +//===----------------------------------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +// <functional> + +// make sure that we can hash enumeration values +// Not very portable + +#if __cplusplus >= 201402L + +#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), "" ); + 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)); + if (sizeof(T) <= sizeof(std::size_t)) + assert(h1(t) == h2(static_cast<under_type>(i))); + } +} + +int main() +{ + test<Cardinals>(); + + test<Colors>(); + test<ShortColors>(); + test<LongColors>(); + test<EightBitColors>(); + + test<Fruits>(); +} +#else +int main () {} +#endif |