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How to: Declare Override Specifiers in Native Compilations

Visual Studio 2012

sealed, abstract, and override are available in compilations that do not use /ZW or /clr.

Note
The ISO C++11 Standard language has the override identifier and the final identifier, and both are supported in Visual Studio Use final instead of sealed in code that is meant to be compiled as native-only.

Example

Description

The following example shows that sealed is valid in native compilations.

Code

// sealed_native_keyword.cpp
#include <stdio.h>
__interface I1 {
   virtual void f();
   virtual void g();
};

class X : public I1 {
public:
   virtual void g() sealed {}
};

class Y : public X {
public:

   // the following override generates a compiler error
   virtual void g() {}   // C3248 X::g is sealed!
};

Example

Description

The next example shows that override is valid in native compilations.

Code

// override_native_keyword.cpp
#include <stdio.h>
__interface I1 {
   virtual void f();
};

class X : public I1 {
public:
   virtual void f() override {}   // OK
   virtual void g() override {}   // C3668 I1::g does not exist
};

Example

Description

This example shows that abstract is valid in native compilations.

Code

// abstract_native_keyword.cpp
class X abstract {};

int main() {
   X * MyX = new X;   // C3622 cannot instantiate abstract class
}

Reference

Override Specifiers (C++ Component Extensions)

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