gistfile1.txt

test2.cpp:9:10: error: no matching function for call to 'all_of'
        cout << all_of(foo.begin(), foo.end(), isdigit);
                ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/stl_algo.h:729:5: note: 
      candidate template ignored: couldn't infer template argument '_Predicate'
    all_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
    ^
1 error generated.