Generates random string in format of GUID (i.e. "{00000000-0000-0000-0000-000000000000}")

FlipCoin-based C++11 random ID generator

bool flipСoin()
{
    bool side = false;
    auto ms = std::chrono::high_resolution_clock::now() + std::chrono::microseconds(10);
    while (std::chrono::high_resolution_clock::now() <= ms) side = !side;
    return side;
}

unsigned char getRandomBit()
{
    bool bit;
    while (true)
    {
        bit = flipСoin();
        if (bit != flipСoin())
            return (unsigned char)bit;
    }

    return 0; // unreachable;
}

unsigned char getRandomByte()
{
    unsigned char n = 0;
    int bits = 8;
    while (bits--)
    {
        n <<= 1;
        n |= getRandomBit();
    }

    return n;
}

// string formatted like GUID, but it is random
std::wstring generateGuid()
{
    std::wstringstream ss;
    ss << L"{";

    for (int i = 0; i < 16; i++)
    {
        if ((i & 0xC ^ 0xC) && (i & ~2) && !(i % 2)) ss << L'-';
        ss << std::setfill(L'0') << std::setw(2) << std::hex << getRandomByte();
    }

    ss << L"}";

    return ss.str();
}