Returning to beginning of file after getline

Question

So i\'ve read all the lines from a file thusly

while (getline(ifile,line))
    {
        // logic
    }

Where ifile is an ifstream and line

Answer 1

Since you have reached (and attempted to read past) the end of the file, the eof and fail flags will be set. You need to clear them using ifile.clear – then try seeking:

ifile.clear();
ifile.seekg(0);

Answer 2

This is because the eof flag has been set on the stream - due to you reaching the end of the file. so you have to clear this as an additional step.

Eg

ifile.clear();
ifile.seekg (0, ios::beg);

Answer 3

FYI: In my case, the order DID matter, thus

1. clear
2. seek

otherwise the next getline operation failed (MSVC v120)