在源文件中定义const数组

Question

I want to define a constant array as data member of class in its source file.

The array has 256 elements, and there is no relation between them.

class Foo {
    private: 
    const int myArray[256] = {
        0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0,
        0, 0, 3, 0, 3, 0, 0, 1, 3, 0, 0, 0, 0, 1, 2, 0,
        0, 0, 2, 2, 1, 0, 3, 2, 0, 2, 0, 0, 0, 0, 0, 0,
        0, 4, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4, 0,
        0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    };
};

My Questions:

1- Is it better to shift the definition of the array to the source file?

2- Is there anyway to define this array in a source file instead of the header that defines the class?

Answer 1

in the header:

static const int myArray[256];

in the cpp file

const int Foo::myArray[256] = {
    // numbers
};

I'm assuming here you don't need one per class instance.

Regarding the question of where it's better to put it; I would put it in the cpp file, but that's mostly a matter of style.