typedef boost::dynamic_bitset<> Bits;

Bits concatenateBitsets(const Bits& first, const Bits& second)
{
    Bits firstCopy(first);
    Bits secondCopy(second);

    //Increase the size of the bit buffer to fit the data being placed in it
    firstCopy.resize(first.size() + second.size());
    secondCopy.resize(first.size() + second.size());

    //shift the bits in the firstCopy to the left
    firstCopy <<= second.size();

    //"copy" the bits from the secondCopy into the firstCopy
    firstCopy |= secondCopy;
    return firstCopy;
}