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Defines an object that cannot be instantiated by itself.


The noncreatable C++ attribute has the same functionality as the noncreatable MIDL attribute and is automatically passed through to the generated .IDL file by the compiler.

When this attribute is used within a project that uses ATL, the behavior of the attribute changes. In addition to the above behavior, the attribute also injects the OBJECT_ENTRY_NON_CREATEABLE_EX_AUTO macro. This macro indicates to ATL that the object cannot be created externally.

// cpp_attr_ref_noncreatable.cpp
// compile with: /LD
#include <unknwn.h>

[object, uuid("11111111-1111-1111-1111-111111111111")]
__interface A 

[coclass, uuid("11111111-1111-1111-1111-111111111112"), noncreatable]
class CMyClass : public A 
   HRESULT xx();
Attribute Context

Applies to

class, struct



Required attributes


Invalid attributes


For more information about the attribute contexts, see Attribute Contexts.

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