#include <boost/filesystem.hpp>
#include <boost/range/iterator_range.hpp>

//returns a list of all the files in a given folder.
std::vector<boost::filesystem::directory_entry> GetAllFilesInFolder(boost::filesystem::path folderPath)
{
    try
    {
        if (exists(folderPath))    // does p actually exist?
        {
            std::vector<boost::filesystem::directory_entry> files;

            if (is_regular_file(folderPath))        // is p a regular file?
                cout << folderPath << " size is " << file_size(folderPath) << '\n';



            else if (is_directory(folderPath))      // is p a directory?
            {
                cout << folderPath << " is a directory containing:\n";
                /*
                copy(boost::filesystem::directory_iterator(folderPath), boost::filesystem::directory_iterator(),  // directory_iterator::value_type
                    ostream_iterator<boost::filesystem::directory_entry>(cout, "\n"));  // is directory_entry, which is
                                                                     // converted to a path by the
                                                                     // path stream inserter
                */
                for (auto& entry : boost::make_iterator_range(boost::filesystem::directory_iterator(folderPath), {}))
                {
                    std::cout << entry << "\n";
                    files.push_back(entry);
                }
                return files;
            }
        }
        else
        {
            cout << folderPath << " does not exist\n";
        }

    }

    catch (const boost::filesystem::filesystem_error& ex)
    {
        cout << ex.what() << '\n';
    }
}

    vector<boost::filesystem::directory_entry> files = GetAllFilesInFolder(folder);