class BlockDevice
{
    virtual std::string GetStreamLabel() const = 0;
    virtual std::string GetStreamName() const = 0;
};


main()
{
        std::vector<shared_ptr<BlockDevice>> blockDevices;
        for (const auto& blkDevice : blockDevices)
        {
         string label = blkDevice->GetStreamLabel();
         string stringname = blkDevice->GetStreamName();
        }
}

'GetStreamLabel': is not a member of 'std::shared_ptr<ScopeEngine::BlockDevice>'
 'GetStreamName': is not a member of 'std::shared_ptr<ScopeEngine::BlockDevice>'