custom_hash.hpp

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#pragma once
#include <boost/functional/hash.hpp>
 
//  Based on: https://www.boost.org/doc/libs/1_61_0/doc/html/hash/combine.html
//  https://stackoverflow.com/questions/39370214/how-to-properly-hash-a-pair-of-pointers
struct pair_hash {
    template<typename T>
    std::size_t operator()(std::pair<T, T> const& p) const {
        std::size_t seed = 0;
        boost::hash_combine(seed, p.first);
        boost::hash_combine(seed, p.second);
 
        return seed;
    }
};