How to convert Byte Array to Hexadecimal String in C++?

Question

I am looking for a fastest way to convert a byte array of arbitrary length to a hexadecimal string. This question has been fully answered here at StackOverflow for C#. Some

Answer 1

One of the fastest way I know in C++ 11:

template 
string BytesArrayToHexString( const std::array& src )
{
  static const char table[] = "0123456789ABCDEF";
  std::array dst;
  const byte* srcPtr = &src[0];
  char* dstPtr = &dst[0];

  for (auto count = byteCount; count > 0; --count)
  {
      unsigned char c = *srcPtr++;
      *dstPtr++ = table[c >> 4];
      *dstPtr++ = table[c & 0x0f];
  }
  *dstPtr = 0;
  return &dst[0];
}

A good compiler should not have any problem to apply SSE optimization on this....