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 function that takes a std::array as a parameter but only for a specific T, in this case char, but for any size array:

The below is malformed:

void f(array<char, size_t N> x) // ???
{
    cout << N;
}

int main()
{
    array<char, 42> A;

    f(A); // should print 42

    array<int, 42> B;

    f(B); // should not compile
}

What is the correct way to write this?

Answer 1

Use a template function:

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