array declaration and definition

[VladimirD]

Hello!
I have the following problem.
I declare in someClass.hpp file some class with static members:

class A
{
...
public:
    static int arr[];
...
};

Then, in someclass.cpp define static members:

int A::arr[] = {1,2,3,4};

When I try to get the size of it in someOtherFile.cpp:

void somefunc()
{
    size_t s = sizeof(A::arr);
    ...
}

I get error message "incomplete type is not allowed".
So, the question is: what am i doing wrong? How can i acquire the size of array in other .cpp file?

[helios]

You have to state the size of the array in the class declaration, otherwise the compiler can't know how big A is.

[VladimirD]

So i have to declare the size of array explicitly, and there is no other way to workaround it?

[helios]

You could change the array into a pointer and allocate it dynamically. Otherwise, no.