现有的C++ Hex Dump Code

#include<iostream>
#include <iomanip>
#include <sstream>
#include<string>
#include<vector>

std::string hex_dump(const std::string& data) {
    std::stringstream ss;
    ss<< std::hex<< std::setfill('0');
    for (size_t i = 0; i< data.size(); ++i) {
        ss<< std::setw(2)<< static_cast<int>(static_cast<unsigned char>(data[i])) << " ";
    }
    return ss.str();
}

int main() {
    std::string data = "Hello, world!";
    std::string hex_dump_str = hex_dump(data);
    std::cout<< hex_dump_str<< std::endl;
    return 0;
}