Ostream c++

Question

How can I have write the function void printData(ostream &os, ...), which writes array's contents in a file or prints out on the console?

Answer 1

Certainly doable if you know the array size at compile time:

const int SIZE = 100;

template <typename T>
void printData(std::ostream &os, T array[SIZE])
{
os.rdbuf(std::cout.rdbuf());
for (int i = 0; i < SIZE; os << array[i++]);
}

// I would suggest std::vector<> as a replacement for flexibility.

template <typename T>
void printData(std::ostream &os, std::vector<T> arr)
{
os.rdbuf(std::cout.rdbuf());
for (T i : arr) os << i;
}