Connection.h

#pragma once
#include "Engine/Core/Types.h"
#include <boost/functional/hash.hpp>
#include <cstddef>
#include <functional>
 
namespace enzo::nt {
 
struct Connection
{
    NodeId sourceNode = 0;
    unsigned int sourceOutput = 0;
    NodeId targetNode = 0;
    unsigned int targetInput = 0;
 
    bool operator==(const Connection& other) const = default;
};
 
} // namespace enzo::nt
 
// Hashing lives in one place so a Connection can key an unordered container.
template <> struct std::hash<enzo::nt::Connection>
{
    std::size_t operator()(const enzo::nt::Connection& connection) const noexcept
    {
        std::size_t seed = 0;
        boost::hash_combine(seed, connection.sourceNode);
        boost::hash_combine(seed, connection.sourceOutput);
        boost::hash_combine(seed, connection.targetNode);
        boost::hash_combine(seed, connection.targetInput);
        return seed;
    }
};