new-new-slot-in-vtable-cpp-component-extensions.md

description	Learn more about: new (new slot in vtable) (C++/CLI and C++/CX)
title	new (new slot in vtable) (C++/CLI and C++/CX)
ms.date	10/12/2018
ms.topic	reference
helpviewer_keywords	new keyword [C++]
ms.assetid	1a9a5704-f02f-46ae-ad65-f0f2b6dbabc3

new (new slot in vtable) (C++/CLI and C++/CX)

The new keyword indicates that a virtual member will get a new slot in the vtable.

All Runtimes

(There are no remarks for this language feature that apply to all runtimes.)

Windows Runtime

Not supported in Windows Runtime.

Common Language Runtime

Remarks

In a /clr compilation, new indicates that a virtual member will get a new slot in the vtable; that the function does not override a base class method.

new causes the newslot modifier to be added to the IL for the function. For more information about newslot, see:

• xref:System.Reflection.MethodInfo.GetBaseDefinition?displayProperty=nameWithType

• xref:System.Reflection.MethodAttributes?displayProperty=nameWithType

Requirements

Compiler option: /clr

Examples

The following sample shows the effect of new.

// newslot.cpp
// compile with: /clr
ref class C {
public:
   virtual void f() {
      System::Console::WriteLine("C::f() called");
   }

   virtual void g() {
      System::Console::WriteLine("C::g() called");
   }
};

ref class D : public C {
public:
   virtual void f() new {
      System::Console::WriteLine("D::f() called");
   }

   virtual void g() override {
      System::Console::WriteLine("D::g() called");
   }
};

ref class E : public D {
public:
   virtual void f() override {
      System::Console::WriteLine("E::f() called");
   }
};

int main() {
   D^ d = gcnew D;
   C^ c = gcnew D;

   c->f();   // calls C::f
   d->f();   // calls D::f

   c->g();   // calls D::g
   d->g();   // calls D::g

   D ^ e = gcnew E;
   e->f();   // calls E::f
}

C::f() called

D::f() called

D::g() called

D::g() called

E::f() called

See also

Component Extensions for .NET and UWP
Override Specifiers