POSIX 파일 설명자에서 C fstream을 어떻게 구성할 수 있나요?

#include <ext/stdio_filebuf.h>
using namespace std;

int main() {
  int posix_handle = open("file.txt", O_RDONLY);  // Open a file with POSIX handle
  __gnu_cxx::stdio_filebuf<char> filebuf(posix_handle, ios::in);  // Create stdio_filebuf from POSIX handle
  ifstream ifs(&filebuf);  // Create ifstream from stdio_filebuf

  // Read from the file
}

#include <cstdio>
#include <fstream>
using namespace std;

FILE *_file = fopen("file.txt", "r");  // Open a file with C file handle
ifstream ifs(_fdopen(_fileno(_file), "r"));  // Create ifstream from FILE*

// Read from the file