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Emulation of CRuntimeClass for non-CObject derived classes

By , 20 Feb 2010
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Introduction

Let's assume you decided to create a hierarchy of non-CObject derived classes using the CRuntimeClass of MFC libraries (and DECLARE_DYNAMIC IMPLEMENT_DYNAMIC DECLARE_DYNCREATE IMPLEMENT_DYNCREATE as well). It is implied that your base class is named like CXxx (C + class prefix) and all your child classes have names according to the rule: C+ class prefix + kind_name (for example, CXxxCool, CXxxAdvanced, CXxxSuper etc.). You need to have a static function Create(string kind_name) to create objects at runtime and a function GetKind returning a string with a 'kind_name' of the object.

Background

Unlike CRuntimeClass (actually it is a structure), our 'CKindOf...' class exists as MACROs DECLARE_KIND_OF(class_name) and IMPLIMENT_KIND_OF(class_name), and every generated 'KindOf' class corresponds with a given class hierarchy.

DECLARE_KIND_OF(Xyz)

IMPLIMENT_KIND_OF(Xyz)

Using the code

The base class of your hierarchy should use the DECLARE_BASE_DYNCLASS(class_name) and IMPLIMENT_BASE_DYNCLASS(class_name) MACROs.

class CXyz
{

public:
    CXyz();
DECLARE_BASE_DYNCLASS(Xyz)
};

IMPLIMENT_BASE_DYNCLASS(Xyz)
CXyz::CXyz()
{

}

And every child class should use DECLARE_CHILD_DYNCLASS(class_name,kind_name) and IMPLIMENT_CHILD_DYNCLASS(class_name,kind_name,parent_name).

class CXyzCool:public CXyz
{
  DECLARE_CHILD_DYNCLASS(Xyz,Cool)
};

IMPLIMENT_CHILD_DYNCLASS(Xyz,Cool,Base)

class CXyzAdv:public CXyzCool
{
  DECLARE_CHILD_DYNCLASS(Xyz,Adv)
};

IMPLIMENT_CHILD_DYNCLASS(Xyz,Adv,Cool)

If your child class is derived directly from the base class (the second level in the class hierarchy), use the 'Base' keyword as the third argument.

IMPLIMENT_CHILD_DYNCLASS(Xyz,Cool,Base)

And the prefix of the base class otherwise:

IMPLIMENT_CHILD_DYNCLASS(Xyz,Adv,Cool)

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

cyberanarchist
Software Developer (Senior) Elstab
Uzbekistan Uzbekistan
No Biography provided

Comments and Discussions

 
GeneralDerived class name for non-CObject derived classes Pinmembergeoyar23-Feb-10 7:29 
GeneralRe: Derived class name for non-CObject derived classes PinmemberRishat Bekmukhamedov23-Feb-10 19:26 
GeneralRe: Derived class name for non-CObject derived classes Pinmembergeoyar25-Feb-10 4:31 
GeneralRe: Derived class name for non-CObject derived classes PinmemberRishat Bekmukhamedov26-Feb-10 2:02 
GeneralSome Explaination PinmemberJohnWallis4221-Feb-10 10:11 
GeneralRe: Some Explaination [modified] PinmemberRishat Bekmukhamedov21-Feb-10 16:41 
GeneralRe: Some Explaination PinmemberJohnWallis4221-Feb-10 17:11 

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