Compiler warning (level 4, off) C4435

'derived_class': Object layout under /vd2 will change due to virtual base 'base_class'

Remarks

This warning is off by default. For more information, see Compiler Warnings That Are Off by Default.

Under the default compile option of /vd1, the derived class doesn't have a vtordisp field for the indicated virtual base. If /vd2 or #pragma vtordisp(2) is in effect, a vtordisp field is present, changing the object layout. This difference can lead to binary compatibility problems if interacting modules are compiled with different vtordisp settings.

Example

The following example generates C4435.

// C4435.cpp
// compile with: /c /W4
#pragma warning(default : 4435)
class A
{
public:
    virtual ~A() {}
};

class B : public virtual A  // C4435
{};

See also

vtordisp
/vd (Disable Construction Displacements)