getTreeView

std::ostringstream treeView;
std::string level = "";

std::string getTreeView(const std::vector<std::shared_ptr<FileSystemObject>>& rootObjects)
{
    std::vector<std::shared_ptr<FileSystemObject>> dirs;
    for (int i = 0; i < rootObjects.size(); i++)
    {
        std::shared_ptr<FileSystemObject> currPtr = rootObjects[i];
        std::shared_ptr<Directory> dir = std::dynamic_pointer_cast<Directory>(currPtr);
        if (dir != nullptr)
        {
            treeView << level << dir->getName() << '\n';
            for(auto iter = dir->begin(); iter != dir->end();++iter)
            {
                std::shared_ptr<FileSystemObject> dirChild = *iter;
                dirs.push_back(dirChild);
            }
            level += "-->";
            if(!dirs.empty())
            {
                getTreeView(dirs);
            }

            return treeView.str();
        }
        else
        {
            treeView << level << currPtr->getName() << '\n';
        }

    }

    level += "--->";
    if(!dirs.empty())
    {
        getTreeView(dirs);
    }

    return treeView.str();
}