Stream Iterators

#include <algorithm> // For std::copy
#include <iostream>
#include <iterator> // For std::istream_iterator and std::ostream_iterator
#include <vector>

int main() {
    std::vector<int> v;

    // Read integers from standard input until EOF
    std::copy(std::istream_iterator<int>(std::cin), // Input iterator reading from std::cin
              std::istream_iterator<int>(),         // End of input iterator (default constructed)
              std::back_inserter(v)                 // Output iterator to insert into vector v
    );

    // Output the contents of the vector to standard output
    std::copy(v.begin(),                            // Beginning of the vector
              v.end(),                              // End of the vector
              std::ostream_iterator<int>(std::cout) // Output iterator writing to std::cout
    );

    return 0;
}