util/bitmap.h
void Set(int c) {
    DCHECK_GE(c, 0);
    DCHECK_LE(c, 255);

    words_[c / 64] |= (1ULL << (c % 64));
  }
// Sets the bit with index c.
Sets the bit with index c.
Sets the bit with index c .
void Set(int c) {
    DCHECK_GE(c, 0);
    DCHECK_LE(c, 255);
    words_[c / 64] |= (1ULL << (c % 64));
  }
void Set ( int c ) { DCHECK_GE ( c , 0 ) ; DCHECK_LE ( c , 255 ) ; words_ [ c / 64 ] |= ( 1ULL << ( c % 64 ) ) ; }
Sets the bit with index c.
Sets the bit with index c .