Function cbegin

lesson6-Segmentation/json.hpp:21006–21011

! @brief returns a const iterator to the first element Returns a const iterator to the first element. @image html range-begin-end.svg "Illustration from cppreference.com" @return const iterator to the first element @complexity Constant. @requirement This function helps `basic_json` satisfying the [Container](https://en.cppreference.com/w/cpp/named_req/Container)

    @since version 1.0.0
    */
    const_iterator cbegin() const noexcept
    {
        const_iterator result(this);
        result.set_begin();
        return result;
    }

    /*!
    @brief returns an iterator to one past the last element