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#include <list> #include <fstream> #include <iterator> std::list<int> retrieve_from( const char* path2file ) { std::ifstream file( "output.txt" ) ; std::istream_iterator<int> begin(file), end ; return std::list<int>( begin, end ) ; } int main() { std::list<int> lst = retrieve_from( "output.txt" ) ; // use list }