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Tip of the Day
Language: C++
Expertise: Beginner
Jul 18, 1997

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File handles/pointers

Question:
In C, I use the FILE *filename. As a beginning C++ programmer, I open streams for reading and writing inside the main() function, but when I try to work with the open files inside another function, it can't reference the original files.

Answer:
The trick is to pass to the function a reference to the same object that you used to open the file in the first place.. Here is an example:

int main ()
{
   ifsteam ifile ("somefile");
   readFile(ifile);
}

void readFile (ifsterm &if)
{
  int i;
  if >> i;
  // any more operations on the stream
}
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