/// from https://ru.stackoverflow.com/a/744329/23044
#include <algorithm>
#include <sstream>
#include <iterator>
#include <iostream>
 
int main()
{
  const char hexstr[] = "89 C2 48 89 F9 E8 CE 55";
  unsigned char bytes[(sizeof hexstr) / 3];
 
  std::istringstream stream {hexstr};
  std::istream_iterator<unsigned> ubytes {stream >> std::hex}, eos;
  auto eob = std::copy(ubytes, eos, bytes);
 
  std::copy(bytes, eob, std::ostream_iterator<unsigned>(std::cout << std::hex, " "));
  std::cout << std::endl;
}
 

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