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#pragma once
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#include <functional>
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#include <tuple>
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template <class ...Types>
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struct hasher {
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template <size_t i = 0> typename std::enable_if< i == sizeof...(Types),
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size_t>::type hashi(const std::tuple<Types...>& record) const {
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return 0;
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}
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template <size_t i = 0> typename std::enable_if< i < sizeof ...(Types),
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size_t>::type hashi(const std::tuple<Types...>& record) const {
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using current_type = typename std::decay<typename std::tuple_element<i, std::tuple<Types...>>::type>::type;
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return std::hash<current_type>()(std::get<i>(record)) ^ hashi<i+1>(record);
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}
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size_t operator()(const std::tuple<Types...>& record) const {
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return hashi(record);
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}
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};
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