#include "zfstream.h"int main() {  // Construct a stream object with this filebuffer.  Anything sent  // to this stream will go to standard out.  gzofstream os( 1, ios::out );  // This text is getting compressed and sent to stdout.  // To prove this, run 'test | zcat'.  os << "Hello, Mommy" << endl;  os << setcompressionlevel( Z_NO_COMPRESSION );  os << "hello, hello, hi, ho!" << endl;  setcompressionlevel( os, Z_DEFAULT_COMPRESSION )    << "I'm compressing again" << endl;  os.close();  return 0;}