How to read integers elegantly using C++ stream?

Question

I have a file full of lines in this format:

1 - 2: 3

I want to only load numbers using C++ streams. Whats the most elegant way to do it? I

Answer 1

Simply,

ifstream file("file.txt");
int n1, n2, n3;
char tmp;
while (file.good()) {
  file >> n1 >> tmp >> n2 >> tmp >> n3;
}