Method isPowerOfTwo

output/java_guava/1.4.16/LongMath.java:101–103

Returns true if x represents a power of two. This differs from Long.bitCount(x) == 1, because Long.bitCount(Long.MIN_VALUE) == 1, but Long#MIN_VALUE is not a power of two.

(long x)

  public static boolean isPowerOfTwo(long x) {
    return x > 0 & (x & (x - 1)) == 0;
  }

  /**
   * Returns 1 if {@code x < y} as unsigned longs, and 0 otherwise. Assumes that x - y fits into a