Compiler Error C3622

 

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The latest version of this topic can be found at Compiler Error C3622.

class' : a class declared as 'keyword' cannot be instantiated

An attempt was made to instantiate a class marked as abstract (or __abstract). A class marked as abstract can be a base class, but it cannot be instantiated.

The following sample generates C3622.

// C3622.cpp  
// compile with: /clr  
ref class a abstract {};  
  
int main() {  
   a aa;   // C3622  
}  

The following sample generates C3622.

// C3622_b.cpp  
// compile with: /clr:oldSyntax  
__abstract class a {  
};  
int main() {  
   a aa;   // C3622  
}  

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