C++11: defining function on std::array

Question

std::array takes two template parameters:

typename T // the element type
size_t N // the size of the array

I want to define a

Answer 1

The N needs to be a static value. You can, e.g., make a template argument:

template <std::size_t N>
void f(std::array<char, N> x) {
    ...
}

In your example, I would still pass the argument by reference, though:

template <std::size_t N>
void f(std::array<char, N> const& x) {
    ...
}

Answer 2

Use a template function:

template<size_t N> void f(array<char, N> x) {
}