How do I give the user a warning and an out if he is opening a file with in ios::out

See more:

C++

I want to provide the user with a warning and a way out if he mistakenly tries to open an exist file with ios::out.

Here is the code I am using to open a new file or wipe an old one clean and begin writing new data.


ofstream output(szSaveName,ios::app);
if(!output)
{
cerr << "Could not open " << szSaveName << endl;
if (cin.peek())
return 0;
}
I lifted this snippet from somewhere a couple of years and didn't anticipate the problems it could cause. People expect to be warned before wiping out data.