Compiler Warning (level 4) C4626

'derived class' : assignment operator could not be generated because a base class assignment operator is inaccessible

An assignment operator was not accessible in a base class and was therefore not generated for a derived class. Any attempt to assign objects of this type will cause a compiler error.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

The following sample generates C4626:

// C4626
// compile with: /W4
#pragma warning(default : 4626)
class B
{
// public:
   B& operator = (const B&)
   {
      return *this;
   }
};

class D : public B
{

}; // C4626, make B's copy constructor public

int main()
{
   D m;
   D n;
   // m = n;   // this line will cause an error
}