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#pragma once
#include <cstddef>
#include <functional>
namespace HashUtils {
template <class T>
void Combine(size_t& seed, const T& v)
{
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
} // namespace HashUtils
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