-
- realesmedia
- Posts: 85
- Joined:
[C++] Deriving from BaseComponent causes using abstract class.
When I create class dirived from BaseComponent and INotifyPropertyChanged compiler shows an error "cannot instantiate abstract class). Compiler helper shows I have no overriden functions: GetBaseObject, AddReference, Release, GetNumReferences.
Noesis 2.0.1f1
Noesis 2.0.1f1
Last edited by realesmedia on 25 Apr 2017, 15:21, edited 2 times in total.
-
- realesmedia
- Posts: 85
- Joined:
Re: [C++] Deriving from BaseComponent causes pure virtual class.
Code: Select all
class BaseDerived : public BaseComponent, public INotifyPropertyChanged {
public:
virtual ~BaseDerived(){}
Noesis::PropertyChangedEventHandler& PropertyChanged() {
return propertyChanged;
}
protected:
Noesis::PropertyChangedEventHandler propertyChanged;
NS_IMPLEMENT_INLINE_REFLECTION(BaseDerived, BaseComponent) {
NsMeta<TypeId>("BaseDerived");
NsImpl<INotifyPropertyChanged>();
}
};
extern "C" NS_DLL_EXPORT void NsRegisterReflection(Noesis::ComponentFactory* factory, NsBool registerComponents) {
NS_REGISTER_COMPONENT(BaseDerived);
}
-
- realesmedia
- Posts: 85
- Joined:
Re: [C++] Deriving from BaseComponent causes pure virtual class.
Next code can solve compiler errors but I don't know if any errors can occurs.
Code: Select all
public:
virtual BaseObject* GetBaseObject() const { return (BaseObject*)this; }
virtual NsInt32 AddReference() const { return BaseRefCounted::AddReference(); }
virtual NsInt32 Release() const { return BaseRefCounted::Release(); }
virtual NsInt32 GetNumReferences() const { return BaseRefCounted::GetNumReferences(); }
-
-
sfernandez
Site Admin
- Posts: 2991
- Joined:
Re: [C++] Deriving from BaseComponent causes using abstract class.
Hi,
In C++ we provide the macro NS_IMPLEMENT_INTERFACE_FIXUP to automatically implement those functions. The macro does almost what you posted, but your code will be smaller:
In C++ we provide the macro NS_IMPLEMENT_INTERFACE_FIXUP to automatically implement those functions. The macro does almost what you posted, but your code will be smaller:
Code: Select all
class BaseDerived : public BaseComponent, public INotifyPropertyChanged {
public:
virtual ~BaseDerived() { }
Noesis::PropertyChangedEventHandler& PropertyChanged() {
return propertyChanged;
}
NS_IMPLEMENT_INTERFACE_FIXUP
protected:
Noesis::PropertyChangedEventHandler propertyChanged;
NS_IMPLEMENT_INLINE_REFLECTION(BaseDerived, BaseComponent) {
NsMeta<TypeId>("BaseDerived");
NsImpl<INotifyPropertyChanged>();
}
};Who is online
Users browsing this forum: Semrush [Bot] and 16 guests