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storage_->get_new_downloader(dir_name, file_name),
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std::function<void(std::shared_ptr<Downloader> const&)>{
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[this](std::shared_ptr<Downloader> const& downloader){
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auto restore_helper = qSharedPointerDynamicCast<RestoreHelper>(helper_);
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restore_helper->set_downloader(downloader);
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fd = restore_helper->get_helper_socket();