Questions tagged [inheritance]
Inheritance is the system in object oriented programming that allows objects to support operations defined by anterior types without having to provide their own definition. It is the major vector for polymorphism in object-oriented programming.
inheritance
42,727
questions
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0
answers
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views
PHP - Issue when adding a return type declaration for a parent class [closed]
I have currently have the following classes:
class Textarea Extends Field {}
class Field {}
I'm trying to declare a return type for the following function
public function field(string $field): Field
...
- 15
0
votes
3
answers
28
views
Overriding a variable assigned to an evaluated method in the parent class using a child class
I am new to object oriented programming. I have a parent class in whose constructor I have a variable (bmi in the below example) that requires a method (bod_mass_idx) of the same class to be evaluated ...
- 53
1
vote
1
answer
42
views
Inheritance and Visibility in Swift
I'm confused about the content in the swift doc:
Notice that the initializer for the EquilateralTriangle class has three different steps:
Setting the value of properties that the subclass declares.
...
- 13
0
votes
1
answer
45
views
Error during inheritance from RazorPage<TModel>
I want to use localization in AspCore Razor Page.
But, I am encountering the following errors:
CS0108: 'Pages_Index.ViewData' hides inherited member 'RazorPage<IndexModel>.ViewData'. Use the new ...
1
vote
2
answers
57
views
How to add an ArrayList in a Superclass using Getters and Setters from a subclass
Here is the super class:
public abstract class ImperialCluster implements Serializable,Clusterable {
private static final long serialVersionUID = 1L;
private String clusterType;
...
0
votes
1
answer
42
views
How would I reference a variable only in an inherited class?
So for a game I'm developing I'm using a inheritance based finite state system for enemy and boss AI. However I'm coming across a few issues with its implementation.
The base state class is inherited ...
-1
votes
0
answers
29
views
how to call same method from parent and child class using child class object when the argument is same but the implementation is different in child [closed]
class Demo1{
void m1(int a) {
System.out.println(a);
}
}
class Demo2 extends Demo1{
void m1(int a) {
System.out.println(a+a);
}
void m1(int ...
-1
votes
1
answer
100
views
How can I avoid calling a static function (and call a base member function instead)?
I have a static instance (previously called singleton, but commenters were taking issue with that) of a class which derives from a base class. So far, so good.
Derived has a static function fun, while ...
- 5,397
0
votes
0
answers
53
views
Virtual Template Best Practice when Realization has small cardinality
I have the virtual template problem, i.e.:
class Base{
public:
// template<bool flag> virtual void eval()=0; // line A
};
class Derived: public Base{
public:
template<bool flag> ...
0
votes
1
answer
64
views
simulate method call mechanism of inheritance
I have a class hierarchy like this:
public class Base { }
public class Child1 : Base { }
public class Child2 : Base { }
I want to generate hashes for those classes. If I implemented these methods ...
- 2,794
0
votes
1
answer
38
views
How to inherit (from a parent class) dataclass field introspection functionality?
I have a parent dataclass, and various other classes will then extend this parent dataclass. Let's call these dataclasses DCs. In the example code below, see ParentDC, and an example ChildDC:
from ...
- 3,840
0
votes
0
answers
61
views
Get parent class in std::type_info map
I might have misunderstand how std::type_info and inheritance works, but when we have:
class A
{
virtual void x() = 0;
}
class B : public A
{
virtual void y() = 0;
}
class C : public B
{
...
-2
votes
0
answers
45
views
Error inheriting non pure virtual function from class that implement another class [closed]
In my code i have this three classes, i'm using the visual studio compiler and it's compiling without any error and runs fine.
But i don't need the methodes width and height in my interface IBrick, if ...
-2
votes
0
answers
57
views
Is there a way to make my compiler warn if my method-call explicitly calls up to a non-direct-parent superclass? [duplicate]
Background: After some careless refactoring, the following dumb mistake crept into my codebase, resulting in a somewhat-hard-to-track-down runtime misbehavior:
class Grandparent
{
public:
void Foo(...
- 72.5k
1
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1
answer
77
views
How to provide a 'blanket implementation' of a static method for the derived class?
Consider this:
struct Base {
static Base make() { return {}; }
};
struct Derived : public Base {
// I _would_ want to have a `static Derived make()` automagically here
};
One approach to the ...
- 480