commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToDoubleHashMap.java [136:168]:
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        System.arraycopy(source.values, 0, values, 0, length);
        states = new byte[length];
        System.arraycopy(source.states, 0, states, 0, length);
        missingEntries = source.missingEntries;
        size  = source.size;
        mask  = source.mask;
        count = source.count;
    }

    /**
     * Compute the capacity needed for a given size.
     * @param expectedSize expected size of the map
     * @return capacity to use for the specified size
     */
    private static int computeCapacity(final int expectedSize) {
        if (expectedSize == 0) {
            return 1;
        }
        final int capacity   = (int) JdkMath.ceil(expectedSize / LOAD_FACTOR);
        final int powerOfTwo = Integer.highestOneBit(capacity);
        if (powerOfTwo == capacity) {
            return capacity;
        }
        return nextPowerOfTwo(capacity);
    }

    /**
     * Find the smallest power of two greater than the input value.
     * @param i input value
     * @return smallest power of two greater than the input value
     */
    private static int nextPowerOfTwo(final int i) {
        return Integer.highestOneBit(i) << 1;
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToFieldHashMap.java [148:180]:
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        System.arraycopy(source.values, 0, values, 0, length);
        states = new byte[length];
        System.arraycopy(source.states, 0, states, 0, length);
        missingEntries = source.missingEntries;
        size  = source.size;
        mask  = source.mask;
        count = source.count;
    }

    /**
     * Compute the capacity needed for a given size.
     * @param expectedSize expected size of the map
     * @return capacity to use for the specified size
     */
    private static int computeCapacity(final int expectedSize) {
        if (expectedSize == 0) {
            return 1;
        }
        final int capacity   = (int) JdkMath.ceil(expectedSize / LOAD_FACTOR);
        final int powerOfTwo = Integer.highestOneBit(capacity);
        if (powerOfTwo == capacity) {
            return capacity;
        }
        return nextPowerOfTwo(capacity);
    }

    /**
     * Find the smallest power of two greater than the input value.
     * @param i input value
     * @return smallest power of two greater than the input value
     */
    private static int nextPowerOfTwo(final int i) {
        return Integer.highestOneBit(i) << 1;
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