Upcasting permits an object of a subclass type to be treated as an object of any superclass type.
Questions tagged [upcasting]
244 questions
-4
votes
1 answer
java cannot upcast to an interface
private class EntryItr implements Iterator> {
...
}
private class KeyItr implements Iterator {
private Iterator> itr;
KeyItr(){
itr=new EntryItr(); // CANNOT CREATE
}
Why cannot upcast…
freestar
- 418
- 3
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-5
votes
1 answer
Assigning a child to a parent
I have a problem assigning a child pointer to a parent one. Here is the example:
class A() {};
class B() : public A {};
class C() {
B* b;
C() { b = new B(); }
B* GetB() { return b; }
}
C* c = new C();
A* a = c->GetB();…
Frion3L
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votes
1 answer
Upcast, downcasting, and hiding methods in C++
I'm writing a C++ library which needs to creates a complex object (D), but return to the user of my library a pointer to a simplified object (B) (hiding many of the methods of the complex object). I have decided to implement this by returning a…
TSG
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