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title How to: Define an Interface Static Constructor (C++/CLI) | Microsoft Docs
ms.custom
ms.date 11/04/2016
ms.technology
cpp-cli
ms.topic conceptual
dev_langs
C++
helpviewer_keywords
constructors [C++]
static constructors, interface
interface static constructor
ms.assetid 1f031cb2-e94f-43dc-819b-44cf2faaaa49
author mikeblome
ms.author mblome
ms.workload
cplusplus
dotnet

How to: Define an Interface Static Constructor (C++/CLI)

An interface can have a static constructor, which can be used to initialize static data members. A static constructor will be called at most once, and will be called before the first time a static interface member is accessed.

Example

// mcppv2_interface_class2.cpp  
// compile with: /clr  
using namespace System;  
  
interface struct MyInterface {  
   static int i;  
   static void Test() {  
      Console::WriteLine(i);  
   }  
  
   static MyInterface() {   
      Console::WriteLine("in MyInterface static constructor");  
      i = 99;  
   }  
};  
  
ref class MyClass : public MyInterface {};  
  
int main() {  
   MyInterface::Test();  
   MyClass::MyInterface::Test();  
  
   MyInterface ^ mi = gcnew MyClass;  
   mi->Test();  
}  

in MyInterface static constructor  
99  
99  
99

See Also

interface class