IsKindOf.cpp

#include <string.h>

#define RUNTIME_TYPE_ID_ROOT(typestr) \
	static const char* Type() {return typestr;} \
	virtual bool IsKindOf(const char* typeName) {return 0 == strcmp(typeName, Type());}

// how about multiple inheritance
#define RUNTIME_TYPE_ID(typestr, baseclass) \
	static const char* Type() {return typestr;} \
	virtual bool IsKindOf(const char* typeName) {return (0 == strcmp(typeName, Type())) || baseclass::IsKindOf(typeName);}

class IObject
{
public:
	virtual ~IObject() {}
	RUNTIME_TYPE_ID_ROOT("IObject");

};

class IGeometry: public IObject
{
public:
	RUNTIME_TYPE_ID("IGeometry", IObject);

};

class IStyle: public IObject
{
public:
	RUNTIME_TYPE_ID("IStyle", IObject);
};

class IBrep: public IGeometry
{
public:
	RUNTIME_TYPE_ID("IBrep", IGeometry);
};

int _tmain(int argc, _TCHAR* argv[])
{
	IBrep* pBrep = new IBrep;
	IStyle* pStyle = new IStyle;

	bool bOk = false;
	bOk = pBrep->IsKindOf(IBrep::Type());
	bOk = pBrep->IsKindOf(IGeometry::Type());
	bOk = pBrep->IsKindOf(IObject::Type());
	bOk = pBrep->IsKindOf(IStyle::Type());

	bOk = pStyle->IsKindOf(IStyle::Type());
	bOk = pStyle->IsKindOf(IObject::Type());
	bOk = pStyle->IsKindOf(IGeometry::Type());


	return 0;
}