Question

How do I pass an entire array pointer as const such that the values cannot be changed? I am passing in an array to a function like this:

double myArr[] { 1, 2, 3, 4, 5 };
double* pArr = myArr;

double myVal = MyFunc(pArr, 5);

MyFunc’s header right now is:

MyFunc(double* pArr, int length)

I want to make sure that the function cannot modify the values inside the array at all.

How do I do this?

Answer 1

Change your function signature to:

MyFunc(double const* pArr, int length);

Note that this is equivalent to:

MyFunc(const double* pArr, int length)

Which one you prefer is a matter of pure taste (I prefer the first, as I find it more readable — it’s the items in pArr that are const, not the pointer itself).