util/digest/sequence.h


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#pragma once 
 
#include "numeric.h" 
#include <util/generic/hash.h> 
#include <util/generic/array_ref.h> 
 
template <typename ElementHash = void> 
class TRangeHash { 
private: 
    template <typename ElementType> 
    using TBase = std::conditional_t< 
        !std::is_void<ElementHash>::value, 
        ElementHash, 
        THash<ElementType>>;
 
public: 
    template <typename Range> 
    size_t operator()(const Range& range) const { 
        size_t accumulated = 0; 
        for (const auto& element : range) { 
            accumulated = CombineHashes(accumulated, TBase<typename Range::value_type>()(element)); 
        } 
        return accumulated; 
    } 
}; 
 
using TSimpleRangeHash = TRangeHash<>; 
 
template <typename RegionHash = void> 
class TContiguousHash { 
private: 
    template <typename ElementType> 
    using TBase = std::conditional_t< 
        !std::is_void<RegionHash>::value, 
        RegionHash, 
        TRangeHash<ElementType>>;
 
public: 
    template <typename ContainerType> 
    auto operator()(const ContainerType& container) const { 
        return operator()(MakeArrayRef(container)); 
    } 
 
    template <typename ElementType> 
    auto operator()(const TArrayRef<ElementType>& data) const {
        return TBase<ElementType>()(data); 
    } 
};