HashFunctions.hpp

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#pragma once
 
#include <cstddef>
 
#include <opencv2/core.hpp>
 
namespace volcart
{
 
template <class Vector>
struct Vec3Hash {
    std::size_t operator()(const Vector& v) const
    {
        auto max = std::max({v[0], v[1], v[2]});
        std::size_t hash = (max * max * max) + (2 * max * v[2]) + v[2];
        if (max == v[2]) {
            auto val = std::max({v[0], v[1]});
            hash +=
                static_cast<std::size_t>(val) * static_cast<std::size_t>(val);
        }
        if (v[1] >= v[0]) {
            hash += v[0] + v[1];
        } else {
            hash += v[1];
        }
        return hash;
    }
};
 
using Vec3iHash = Vec3Hash<cv::Vec3i>;
 
}  // namespace volcart