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Posted 8 Mar 2005

Functor as event engine

, 8 Mar 2005
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Functor implementation. Event mechanism creation.


Functor implementation

Functor is a wrapper around function. It's useful to unify static and member function calls. Also it's profitable for event mechanism creation.

Syntax represented below works only on MSVC++ 7.1, this file have defines for 6.0 also but you won't be happy using them.


IFunctor - common interface for all functors. It has few functions:

Call() - calls bounded function,

operator () - calls Call

IsEqual(IFunctor *) - returns true if both functors are bounded with the same function.


IFunctor is inherited from IRefCounted

IRefCounted has these methods:

AddRef() - increments reference counter

Release() - decrements reference counter and deletes object when reference count is zero.

DecreaseRef() - decrements reference counter without deletion

GetFunctor() - overloaded function that creates functor, returns IFunctor

GetFunctor(StaticFunction) - creates static functor

GetFunctor(&obj/*CMyObj */, CMyObj::Function) - creates member functor

GetFunctor(pFunctor/*IFunctor* */) - creates member functor


GetFunctor returns pointer to IFunctor with zero reference counter. So AddRef and then Release will free allocated memory.

CFunctorSet - container for IFunctor*. Also derived from IFunctor, has methods:

operator +=(IFunctor*) - appends functor

operator -=(IFunctor*) - removes functor (and not only if pointers are equal: it uses IsEqual on functors)

Call - calls all functors

operator () -calls Call


operator +=() calls AddRef on given functor pointer

operator -=() calls Release on given functor pointer

So though GetFunctor allocates memory, CFunctorSet releases it.

Thus, in different cases  you must first AddRef and then after all Release pointer returned by GetFunctor.


        CFunctorSet<void (*)(int)> m_vMyEvent;<br/>
        void MyStaticFn(int){}<br/>
        class CMyClass{
            void MyMemFn(int){}
        CMyClass obj;
        m_vMyEvent+=GetFunctor(&obj, CMyClass::MyMemFn);
        m_vMyEvent(1); //calls both functions
        m_vMyEvent-=GetFunctor(MyStaticFn); //it works 'cause operator -=() uses IsEqual
        m_vMyEvent(2); //calls only member function of CMyClass obj.


CDeferredFunctor - intended for deferred calls in cross thread communication. Methods:

constructor - binds functor

operator =() - binds functor

Call - stores arguments

DeferredCall - calls bounded functor with stored arguments

IsCalled() - returns true if Call is already made but DeferredCall is still not

DeferredCallSaveResult() - saves result of calling

GetResult() - returns result saved by DeferredCallSaveResult

SetOnCall() - allows to set functor that will be called during Call

CRemoteFunctor - same as CDeferredFunctor but stores arguments in IStream. Methods:

constructor - binds functor

Call - stores arguments

RemoteCall - calls bounded functor with stored arguments

GetData(IStream * pStream) - copies internal stream to given

SetData(IStream * pStream, bool bRewind=true) - copies given stream to the internal, sets given stream to start optionally before copying

SetOnCall - allows to set functor that will be called during Call


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Software Developer (Senior)
Russian Federation Russian Federation
As programmer I understand that every program takes brain to be created. The more complex is the software, the more senior developers it takes. And they say that DNA doesn't have an author? I don't buy it.

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Comments and Discussions

Generalnew comments Pin
araud9-Mar-05 22:19
memberaraud9-Mar-05 22:19 
GeneralBad programming Pin
Christian Graus8-Mar-05 14:58
memberChristian Graus8-Mar-05 14:58 
GeneralRe: Bad programming Pin
araud8-Mar-05 17:45
memberaraud8-Mar-05 17:45 
GeneralRe: Bad programming Pin
Christian Graus8-Mar-05 17:55
memberChristian Graus8-Mar-05 17:55 
GeneralRe: Bad programming Pin
araud8-Mar-05 19:38
memberaraud8-Mar-05 19:38 
GeneralHmmmm Pin
Kochise8-Mar-05 21:42
memberKochise8-Mar-05 21:42 
GeneralRe: Hmmmm Pin
araud8-Mar-05 23:28
memberaraud8-Mar-05 23:28 
GeneralI don't believe in God... Pin
Kochise9-Mar-05 0:27
memberKochise9-Mar-05 0:27 
GeneralRe: I don't believe in God... Pin
araud9-Mar-05 1:08
memberaraud9-Mar-05 1:08 
GeneralHey :) Pin
Kochise9-Mar-05 1:53
memberKochise9-Mar-05 1:53 
GeneralRe: Hmmmm Pin
Christian Graus9-Mar-05 12:58
memberChristian Graus9-Mar-05 12:58 
GeneralRe: Bad programming Pin
Christian Graus9-Mar-05 12:56
memberChristian Graus9-Mar-05 12:56 
GeneralRe: Bad programming Pin
araud9-Mar-05 20:52
memberaraud9-Mar-05 20:52 
GeneralRe: Bad programming Pin
Christian Graus10-Mar-05 9:34
memberChristian Graus10-Mar-05 9:34 
GeneralRe: Bad programming Pin
araud10-Mar-05 20:56
memberaraud10-Mar-05 20:56 
GeneralRe: Bad programming Pin
Christian Graus14-Mar-05 11:02
memberChristian Graus14-Mar-05 11:02 
GeneralGood programming Pin
araud14-Mar-05 20:16
memberaraud14-Mar-05 20:16 
GeneralRe: Good programming Pin
Christian Graus15-Mar-05 10:11
memberChristian Graus15-Mar-05 10:11 
GeneralRe: Good programming Pin
araud15-Mar-05 18:44
memberaraud15-Mar-05 18:44 
GeneralRe: Good programming Pin
Christian Graus16-Mar-05 12:21
memberChristian Graus16-Mar-05 12:21 
GeneralCode is very hard to read! Pin
Don Clugston8-Mar-05 13:22
memberDon Clugston8-Mar-05 13:22 
GeneralRe: Code is very hard to read! Pin
araud8-Mar-05 17:58
memberaraud8-Mar-05 17:58 
GeneralRe: Code is very hard to read! Pin
CP Visitor9-Mar-05 6:45
memberCP Visitor9-Mar-05 6:45 
GeneralRe: Code is very hard to read! Pin
araud9-Mar-05 20:11
memberaraud9-Mar-05 20:11 
Generalgood idea! Pin
WoR8-Mar-05 8:04
memberWoR8-Mar-05 8:04 

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