boost c++ ,list dir non recursive with filter by extension

path current_dir("."); //
std::string name , extension;
for (directory_iterator iter(current_dir), end; iter != end; ++iter)
{

name = boost::filesystem::basename(iter->path().filename());
extension = boost::filesystem::extension(iter->path().filename());

name+=extension;

if (name==".txt" || name==".TXT")
std::cout << name << "\n";

}