Method isPowerOfTwo

output/java_guava/1.4.18/BigIntegerMath.java:81–84

Returns true if x represents a power of two.

(BigInteger x)

  public static boolean isPowerOfTwo(BigInteger x) {
    checkNotNull(x);
    return x.signum() > 0 && x.getLowestSetBit() == x.bitLength() - 1;
  }

  /**
   * Returns the base-2 logarithm of {@code x}, rounded according to the specified rounding mode.