| 1 | /* Hash function characterization. |
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| 2 | * |
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| 3 | * Copyright 2022 Joaquin M Lopez Munoz. |
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| 4 | * Distributed under the Boost Software License, Version 1.0. |
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| 5 | * (See accompanying file LICENSE_1_0.txt or copy at |
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| 6 | * http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | * |
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| 8 | * See https://www.boost.org/libs/unordered for library home page. |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef BOOST_UNORDERED_HASH_TRAITS_HPP |
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| 12 | #define BOOST_UNORDERED_HASH_TRAITS_HPP |
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| 13 | |
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| 14 | #include <boost/unordered/detail/type_traits.hpp> |
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| 15 | |
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| 16 | namespace boost{ |
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| 17 | namespace unordered{ |
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| 18 | |
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| 19 | namespace detail{ |
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| 20 | |
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| 21 | template<typename Hash,typename=void> |
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| 22 | struct hash_is_avalanching_impl: std::false_type{}; |
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| 23 | |
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| 24 | template<typename Hash> |
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| 25 | struct hash_is_avalanching_impl<Hash, |
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| 26 | boost::unordered::detail::void_t<typename Hash::is_avalanching> >: |
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| 27 | std::true_type{}; |
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| 28 | |
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| 29 | } /* namespace detail */ |
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| 30 | |
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| 31 | /* Each trait can be partially specialized by users for concrete hash functions |
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| 32 | * when actual characterization differs from default. |
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| 33 | */ |
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| 34 | |
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| 35 | /* hash_is_avalanching<Hash>::value is true when the type Hash::is_avalanching |
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| 36 | * is present, false otherwise. |
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| 37 | */ |
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| 38 | template<typename Hash> |
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| 39 | struct hash_is_avalanching: detail::hash_is_avalanching_impl<Hash>::type{}; |
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| 40 | |
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| 41 | } /* namespace unordered */ |
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| 42 | } /* namespace boost */ |
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| 43 | |
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| 44 | #endif |
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| 45 | |
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