Doublet.h

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namespace Platform::Data::Doublets
{
    // todo! use link concept
    template <typename T>
    struct Doublet
    {
      public:
        T Source = 0;
 
      public:
        T Target = 0;
 
      public:
        Doublet(T source = 0, T target = 0) : Source(source), Target(target) {}
 
      public:
        explicit operator std::string() const
        {
            return std::string("")
                .append(Platform::Converters::To<std::string>(Source))
                .append("->")
                .append(Platform::Converters::To<std::string>(Target));
        }
 
      public:
        friend std::ostream& operator<<(std::ostream& stream, const Doublet<T>& self)
        {
            return stream << static_cast<std::string>(self);
        }
 
      public:
        bool operator==(const Doublet<T>& other) const = default;
    };
 
    template <typename... Args>
    Doublet(Args...) -> Doublet<std::common_type_t<Args...>>;
} // namespace Platform::Data::Doublets
 
template <typename T>
struct std::hash<Platform::Data::Doublets::Doublet<T>>
{
    std::size_t operator()(const Platform::Data::Doublets::Doublet<T>& self) const
    {
        return Platform::Hashing::Hash(self.Source, self.Target);
    }
};