c++ pass ofstream as argument

To pass an ofstream as an argument in C++, you can follow these steps:

1. Define a function that takes an ofstream object as a parameter. For example:

void writeToFile(std::ofstream& outputFile) {
  // Function body
}

1. Inside the function, you can use the outputFile object to perform file output operations, such as writing data to a file. For example:

void writeToFile(std::ofstream& outputFile) {
  // Write data to the file
  outputFile << "Hello, World!";
}

1. Outside the function, create an instance of ofstream and open the file you want to write to. For example:

int main() {
  std::ofstream outputFile("output.txt");
  if(outputFile.is_open()) {
    // Call the function and pass the ofstream object
    writeToFile(outputFile);
    outputFile.close();
  }
  return 0;
}

In the above example, the outputFile object is passed to the writeToFile function by reference (& symbol). This allows the function to directly modify the outputFile object and perform file output operations on it.

By following these steps, you can pass an ofstream as an argument in C++ and use it to perform file output operations within a function.