Function get_ref_impl

3rd/nlohmann_json/include/nlohmann/json.hpp:2960–2971

    */
    template<typename ReferenceType, typename ThisType>
    static ReferenceType get_ref_impl(ThisType& obj)
    {
        // delegate the call to get_ptr<>()
        auto* ptr = obj.template get_ptr<typename std::add_pointer<ReferenceType>::type>();

        if (JSON_HEDLEY_LIKELY(ptr != nullptr))
        {
            return *ptr;
        }

        JSON_THROW(type_error::create(303, "incompatible ReferenceType for get_ref, actual type is " + std::string(obj.type_name()), obj));
    }

  public:
    /// @name value access