Test.cpp

#include <iterator>
#include <fstream>
#include <iostream>

template<typename T>
class FWrapper
{
    std::ifstream&  file;
    public:
        FWrapper(std::ifstream& file)
            : file(file)
        {}
        std::istream_iterator<T> begin()    {return std::istream_iterator<T>(file);}
        std::istream_iterator<T> end()      {return std::istream_iterator<T>();}
};

int main()
{
    std::ifstream f("data");
    FWrapper<char> file(f);
    for(auto x: file)
    {
        std::cout << x << " ";
    }
}