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Comment by ajtulloch | Hacker News Reader

FWIW, with folly::gen [1], this is just:

    using namespace folly::gen;
    byLine('/a/file/with/numbers') | eachTo<int> | sum;

https://github.com/facebook/folly/tree/master/folly/gen

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It's only 2 lines even restricting yourself to the standard library

    #include <fstream>
    #include <iterator>
    #include <numeric>
    using namespace std;

    int main() {
        ifstream nf ("numbers.txt");
        return accumulate (istream_iterator<int>(nf), istream_iterator<int>(), 0);
    }

Thank you for this. Got me really interested in folly now.

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