passing array (not vector) to function

I want to do this

void DoSomething (int arr[])
{
// do something
}

but instead of arr[] it’s std::array

void DoSomething (std::array <int> arr) // <--- incorrect way to declare an array
{
// do something
}

Using std::vector instead of std::array works, but I expect a workaround with std::array, since arr[] works just fine.

This works too

const int arrSize;
void DoSomething (std::array <int,arrSize> arr)
{
// do something
}

but again, I expect a way to do this without any extra declarations.

>Solution :

std::array is a template. If you want to accept a std::array of any size, your function will have to become a template as well, eg:

template <size_t N>
void DoSomething (std::array<int, N> arr)
{
    // do something
}

The compiler can then deduce N for you, based on whatever std::array you pass in.