Modern C++ Programming Cookbook

How to do it...

To find files that match particular criteria, use the following pattern, exemplified in the find_files() function, as follows:

1. Use recursive_directory_iterator to iterate through all the entries of a directory and recursively through its subdirectories.
2. Consider regular files (and any other type of files you may need to process).
3. Use a function object (such as a lambda expression) to filter only the files that match your criteria.
4. Add the selected entries to a range (such as a vector):

        std::vector<fs::path> find_files(           fs::path const & dir,            std::function<bool(fs::path const&)> filter)        {          auto result = std::vector<fs::path>{};          if (fs::exists(dir))          {            for (auto const & entry :               fs::recursive_directory_iterator(                dir,  fs::directory_options::follow_directory_symlink)) ...