hash_util.h

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#pragma once
 
#include <boost/functional/hash.hpp>
 
namespace std {
template<typename T>
struct hash<std::vector<T>> {
    std::size_t operator()(const std::vector<T>& v) const {
        std::size_t seed = 0;
        std::hash<T> h;
        for (const auto& t : v)
            boost::hash_combine(seed, h(t));
        return seed;
    }
};
} // namespace std