CComClassFactorySingleton Class
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CComClassFactorySingleton Class

This class derives from CComClassFactory and uses CComObjectGlobal to construct a single object.

template<
   class T
>
class CComClassFactorySingleton :
   public CComClassFactory

T

Your class.

CComClassFactorySingleton derives from CComClassFactory and uses CComObjectGlobal to construct a single object. Each call to the CreateInstance method simply queries this object for an interface pointer.

ATL objects normally acquire a class factory by deriving from CComCoClass. This class includes the macro DECLARE_CLASSFACTORY, which declares CComClassFactory as the default class factory. To use CComClassFactorySingleton, specify the DECLARE_CLASSFACTORY_SINGLETON macro in your object's class definition. For example:


class ATL_NO_VTABLE CMySingletonClass :
   public CComObjectRootEx<CComSingleThreadModel>,
   public CComCoClass<CMySingletonClass, &CLSID_MySingletonClass>,
   public IMySingletonClass
{
public:
   DECLARE_CLASSFACTORY_SINGLETON(CMySingletonClass)

   // Remainder of class declaration omitted.


Header: atlcom.h

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