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#include <fstream>
#include <string>

void f(const std::string &file_namefileName) {
  std::fstream file(file_namefileName);
  if (!file.is_open()) {
    // Handle error
    return;
  }
  
  file << "Output some data";
  std::string str;
  file >> str;
}

#include <fstream>
#include <string>

void f(const std::string &file_namefileName) {
  std::fstream file(file_namefileName);
  if (!file.is_open()) {
    // Handle error
    return;
  }
  
  file << "Output some data";
 
  std::string str;
  file.seekg(0, std::ios::beg);
  file >> str;
}