Method on_string

include/boost/json/detail/parse_into.hpp:1075–1080

    }

    bool on_string(system::error_code& ec, string_view)
    {
        if( (array_depth_ + object_depth_) == 0 )
            return parent_->signal_value(ec);
        return true;
    }

    bool on_number_part(system::error_code&)
    {