C++ :: Defining Vector In Header File?

Suppose I have the following sample header file test.h

Code:
#include "myCommon.h"
class Test {
public:
Test();
vector<vector<vector<double>>> vI3(dim1, vector<vector<double>> (dim2, vector<double> (dim2, 0.0f)));
private:
fillVector();
}

In above test.h dim1 and dim2 are defined in a different header file, i.e. myCommon.h

Code:
const long dim1 = 40;
enum dimVector {
RED,
GREEN,
dim2
};

However, it gives the errors when I compile: variable "dim1" is not a type name and for variable "dim2" it complains about a duplicate parameter name.

The declarations of dim1 and dim2 should stay in myCommon.h. They can also be defined in myCommon.cpp if needed, but can't go into test.h.