#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
#include <iomanip>
 
int main() {
    // широкие символы
    std::wstring wstr = L"Я строка в UCS-2. がダウンロードできません";
    // широкие символы в UTF-8
    std::wstring_convert<std::codecvt_utf8<wchar_t>> conv;
    std::cout << "Chr | UTF-8\n============\n";
    for(const auto &c:wstr) {
      std::string u8str = conv.to_bytes(c);        
      std::cout << u8str << "   : ";  
      for(const uint8_t &i:u8str) 
      std::cout << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(i) << ' ';
      std::cout << std::dec << '\n';  
    }
    return 0;
}

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