So I wanna find the best possible way of initalizing std:array in below configuration (better way would to be to be able to use cols and rows variables while declaring array size):

class Engine {
protected:
    const int rows = 30;
    const int cols = 100;
    std::array<std::array<int, 100>, 30> arr;
}

How do initalize it properly – I mean my rows and cols are gonna be const, so:

• do I just make row and cols static const and then some initalize arr at compile time with those variables?
• is intalizing arr this way is ok or is it tragic?

Anyway I want to find best possible (like golden standrad) way of initalizing it, while I know how my array will looks like at compile time.