39 lines
1008 B
C++
39 lines
1008 B
C++
#pragma once
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#include "../hash.hpp"
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#include "./mix.hpp"
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#include <tuple>
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namespace cruft::hash {
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/// Computes a hash for a tuple type by elementwise hashing, then variadic mixing.
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///
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/// \tparam ElementT The per-element hash type
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/// \tparam MixT The mixing hash type. Must support variadic operator()
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template <
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typename ElementT,
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typename MixT = cruft::hash::mixer
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>
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class tuple {
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public:
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using is_transparent = void;
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template <typename ...ValueT>
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auto
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operator() (std::tuple<ValueT...> const &val) const
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{
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return compute (val, std::make_index_sequence<sizeof... (ValueT)> {});
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}
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private:
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template <typename ...ValueT, std::size_t ...IndexV>
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auto
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compute (std::tuple<ValueT...> const &val, std::index_sequence<IndexV...>) const
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{
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return MixT {} (
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ElementT {} (std::get<IndexV> (val))...
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);
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}
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};
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} |