hardlink a directory recursively

hardlink.cpp

#include <exception>
#include <filesystem>
#include <iostream>
#include <string>
#include <stack>

void hardlink_dir(
    const std::experimental::filesystem::path& fromRoot,
    const std::experimental::filesystem::path& toRoot)
{
    using namespace std::experimental::filesystem;

    std::stack<path> dirsToVisit{ { path{} } };

    while (!dirsToVisit.empty())
    {
        const auto subDir = std::move(dirsToVisit.top());
        dirsToVisit.pop();

        const auto fromDir = fromRoot / subDir;
        const auto toDir = toRoot / subDir;

        create_directory(toDir);

        for (const directory_entry& fromDirEntry : directory_iterator(fromDir))
        {
            const auto fromFilename = fromDirEntry.path().filename();

            switch (fromDirEntry.status().type())
            {
                case file_type::regular:
                    create_hard_link(fromDirEntry.path(), toDir / fromFilename);
                    break;

                case file_type::directory:
                    dirsToVisit.push(subDir / fromFilename);
                    break;
            }
        }
    }
}

int main()
{
    try
    {
        std::experimental::filesystem::path root{ L"C:\\users\\gpollard\\desktop" };

        hardlink_dir(root / L"copy", root / L"copy_to");
    }
    catch (const std::exception& ex)
    {
        std::cerr << ex.what() << std::endl;
        return 1;
    }

    return 0;
}