How to read groups of integers from a file, line by line in C++

I have a text file with on every line one or more integers, seperated by a space. How can I in an elegant way read this with C++? If I would not care about the lines I could use cin >>, but it matters on which line integers are.

Example input:

1213 153 15 155
84 866 89 48
12
12 12 58
12

c++ input

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How to read groups of integers from a file, line by line in C++

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