E2458 Delphi classes have to be derived from Delphi classes (C++)

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You cannot derive a Delphi style class from a non-Delphi style class. Delphi style classes derive directly or indirectly from System::TObject.

Example:

struct base// base not a Delphi style class
{
intbasemem;
};
struct __declspec(delphiclass) derived : base // or
{
intderivedmem;
};