* IntMath} and {@link BigIntegerMath} respectively. For other common operations on {@code long}
 * values, see {@link com.google.common.primitives.Longs}.
 *
 * @author Louis Wasserman
 * @since 11.0
 */
@GwtCompatible
public final class LongMath {
  @VisibleForTesting static final long MAX_SIGNED_POWER_OF_TWO = 1L << (Long.SIZE - 2);

  /**

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Ints.toArray(bytes)).isEqualTo(array);
    assertThat(Ints.toArray(shorts)).isEqualTo(array);
    assertThat(Ints.toArray(ints)).isEqualTo(array);
    assertThat(Ints.toArray(floats)).isEqualTo(array);
    assertThat(Ints.toArray(longs)).isEqualTo(array);

import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableList;
import com.google.common.math.StatsTesting.ManyValues;
import com.google.common.primitives.Doubles;
import com.google.common.primitives.Longs;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link StatsAccumulator}. This tests the stats methods for instances built with {@link

    // Serial form:
    // 1 signed byte for the strategy
    // 1 unsigned byte for the number of hash functions
    // 1 big endian int, the number of longs in our bitset
    // N big endian longs of our bitset
    DataOutputStream dout = new DataOutputStream(out);
    dout.writeByte(SignedBytes.checkedCast(strategy.ordinal()));

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Doubles.toArray(bytes)).isEqualTo(array);
    assertThat(Doubles.toArray(shorts)).isEqualTo(array);
    assertThat(Doubles.toArray(ints)).isEqualTo(array);
    assertThat(Doubles.toArray(floats)).isEqualTo(array);
    assertThat(Doubles.toArray(longs)).isEqualTo(array);

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Shorts.toArray(bytes)).isEqualTo(array);
    assertThat(Shorts.toArray(shorts)).isEqualTo(array);
    assertThat(Shorts.toArray(ints)).isEqualTo(array);
    assertThat(Shorts.toArray(floats)).isEqualTo(array);
    assertThat(Shorts.toArray(longs)).isEqualTo(array);

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Floats.toArray(bytes)).isEqualTo(array);
    assertThat(Floats.toArray(shorts)).isEqualTo(array);
    assertThat(Floats.toArray(ints)).isEqualTo(array);
    assertThat(Floats.toArray(floats)).isEqualTo(array);
    assertThat(Floats.toArray(longs)).isEqualTo(array);

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Ints.toArray(bytes)).isEqualTo(array);
    assertThat(Ints.toArray(shorts)).isEqualTo(array);
    assertThat(Ints.toArray(ints)).isEqualTo(array);
    assertThat(Ints.toArray(floats)).isEqualTo(array);
    assertThat(Ints.toArray(longs)).isEqualTo(array);

    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Floats.toArray(bytes)).isEqualTo(array);
    assertThat(Floats.toArray(shorts)).isEqualTo(array);
    assertThat(Floats.toArray(ints)).isEqualTo(array);
    assertThat(Floats.toArray(floats)).isEqualTo(array);
    assertThat(Floats.toArray(longs)).isEqualTo(array);

    int bits = LongMath.log2(startingNumber, FLOOR) + 1;
    // Check for the next power of two boundary, to save us a CLZ operation.
    int nextPowerOfTwo = 1 << (bits - 1);

    // Iteratively multiply the longs as big as they can go.
    for (long num = startingNumber; num <= n; num++) {
      // Check to see if the floor(log2(num)) + 1 has changed.
      if ((num & nextPowerOfTwo) != 0) {
        nextPowerOfTwo <<= 1;