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Compiler Warning (level 2) C4356

'member' : static data member cannot be initialized via derived class

The initialization of a static data member was ill formed. The compiler accepted the initialization.

This is a breaking change in the Visual C++ .NET 2003 compiler. See Summary of Compile-Time Breaking Changes for more information.

For code that works the same in all versions of Visual C++, initialize the member through the base class.

The following sample generates C4356:

// C4356.cpp
// compile with: /W2 /EHsc
#include <iostream>

template <class T>
class C
{
   static int n;
};

class D : C<int>
{
};

int D::n = 0; // C4356
// try the following line instead
// int C<int>::n = 0;

class A
{
public:
   static int n;
};

class B : public A
{
};

int B::n = 10;   // C4356
// try the following line instead
// int A::n = 99;

int main()
{
   using namespace std;
   B myb;
   cout << B::n << endl;
}
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