How would I create a hex dump utility in C++?

Question

Basically, I need to write a hex dump utility using C++. It\'ll look something like this

Answer 1

#include 
#include 
#include 
#include 

template>>
container_type arrange_bytes(const byte_type* buffer, const std::size_t size, const std::size_t w = 16) {
  return std::accumulate(buffer, buffer + size, container_type{{}}, [w](auto& acc, const byte_type byte) {
    if(acc.back().size() >= w) {
      acc.push_back({});
    }
    acc.back().push_back(byte);
    return acc;
  });
}

std::string init_text_row(const int offset) {
  std::ostringstream ost{};
  ost << std::hex << std::setfill('0') << std::setw(8) << offset;
  return ost.str();
}

template
std::string format_row(const std::vector& bytes, const int offset) {
  auto init = init_text_row(offset);
  return std::accumulate(bytes.begin(), bytes.end(), init, [](auto& acc, const auto& byte) {
      std::ostringstream ost{};
      ost  << ' ' << std::hex << std::setfill('0') << static_cast(byte);
      return acc + ost.str();
  });
}

template>>
std::string format_bytes(const container_type& bytes) {
  struct memory {
    std::string data = {};
    int offset = 0;
  };
  return std::accumulate(bytes.begin(), bytes.end(), memory{}, [](auto& acc, const auto& row) {
    acc.data += format_row(row, acc.offset) + '\n';
    acc.offset += row.size();
    return acc;
  }).data;
}

template
std::string hexdump(const byte_type* buffer, std::size_t size) {
  return format_bytes(arrange_bytes(buffer, size));
}

#include 

int main() {
  const auto* message = "Hello, world! I am Simon the Sourcerer and I am a mighty pirate!";
  const auto len = std::strlen(message);
  std::cout << hexdump(message, len) << std::endl;
  return 0;
}