Cross-platform PRNG seed

seed_type prng_seed = 0;  // suitable integral type
MyRNG     prng;           // something from <random>

void initPRNG()
{
  bool seedsuccess = false;

#ifdef WIN32
  HCRYPTPROV hCryptProv;
  BYTE* pbData = reinterpret_cast<BYTE*>(&prng_seed);

  if (CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0))
  {
    if (CryptGenRandom(hCryptProv, sizeof(prng_seed), pbData))
    {
      seedsuccess = true;
    }
    CryptReleaseContext(hCryptProv, 0);
  }
#else
  std::ifstream urandom("/dev/urandom");
  if (urandom)
  {
    urandom.read(reinterpret_cast<char*>(&prng_seed), sizeof(prng_seed));
    seedsuccess = true;
  }
#endif

  if (!seedsuccess)
  {
    prng_seed = std::time(NULL);
  }

  //std::cout << "Seeding the PRNG with: 0x" << std::hex << std::uppercase << std::setfill('0')
  //          << std::setw(2 * sizeof(MyRNG::result_type)) << prng_seed << std::endl;

  prng.seed(prng_seed);
}