Function swap

extern/json/json.hpp:22676–22689

@brief exchanges the values @sa https://json.nlohmann.me/api/basic_json/swap/

    /// @brief exchanges the values
    /// @sa https://json.nlohmann.me/api/basic_json/swap/
    void swap(reference other) noexcept (
        std::is_nothrow_move_constructible<value_t>::value&&
        std::is_nothrow_move_assignable<value_t>::value&&
        std::is_nothrow_move_constructible<json_value>::value&&
        std::is_nothrow_move_assignable<json_value>::value
    )
    {
        std::swap(m_type, other.m_type);
        std::swap(m_value, other.m_value);

        set_parents();
        other.set_parents();
        assert_invariant();
    }

    /// @brief exchanges the values
    /// @sa https://json.nlohmann.me/api/basic_json/swap/