How to get list of files with a specific extension in a given folder?

by 
#define BOOST_FILESYSTEM_VERSION 3
#define BOOST_FILESYSTEM_NO_DEPRECATED 
#include <boost/filesystem.hpp>

namespace fs = boost::filesystem;

/**
 * \brief   Return the filenames of all files that have the specified extension
 *          in the specified directory and all subdirectories.
 */
std::vector<fs::path> get_all(fs::path const & root, std::string const & ext)
{
    std::vector<fs::path> paths;

    if (fs::exists(root) && fs::is_directory(root))
    {
        for (auto const & entry : fs::recursive_directory_iterator(root))
        {
            if (fs::is_regular_file(entry) && entry.path().extension() == ext)
                paths.emplace_back(entry.path().filename());
        }
    }

    return paths;
}

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