Function begin

Source/Utils/json.hpp:20965–20970

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

        @since version 1.0.0
        */
        iterator begin() noexcept
        {
            iterator result(this);
            result.set_begin();
            return result;
        }

        /*!
        @copydoc basic_json::cbegin()