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
42,733
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C# Generic with both notnull and nullable fields
I need a class for a regular tree in the whole project. Sometimes the tree is used with a string key and sometimes with a Guid key.
This class should have not null Id and nullable ParentId.
If i use ...
-1
votes
3
answers
125
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Are all abstract classes parent classes? [closed]
I started learning Java few months ago. I am wondering if all abstract classes are parent classes. An abstract method in an abstract class won’t have a body. So the abstract method it must be ...
2
votes
1
answer
29
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associations inherited from parent class
a specialization of a class, inherits all the attributes and associations of the parent class. Can a specialization not participate in an association of the parent class?
example: an employee and his ...
- 333
1
vote
2
answers
65
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Is it possible to override a Point2D object from a superclass to a Point2D.Float?
I have defined a class called Entity with a Point2D object in it called pos. The class is a superclass and it's not specified if pos should be a Point2D.Float or a Point2D.Double, that's left for the ...
0
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1
answer
113
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Does C++ automatically downcast in order to find the right virtual function? [duplicate]
Question Polymorphism, Downcasting, and Virtual Functions seems vague and I'm not sure whether it's the same or a different question. One answer seems to answer my question (yes), but to make sure it'...
- 2,814
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Initiliazation of members in case of multiple inheritance [duplicate]
I have the following architecture
#include <iostream>
class A_Base {
public:
A_Base () : foo(14) { }
protected:
int foo;
// In my real case, A_Base has a lot of members
};
...
- 359
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votes
2
answers
93
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Inherit interface and automatically implement the properties
I have a case where I should inherit a class from an interface that will automatically implement without typing the implementation inside the parent class, is it possible?
For example:
public ...
- 41
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1
answer
52
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inheritance issue with derived class and multiple inheritance [closed]
I have following architecture
class A_Base {
virtual foo() { } }
class A_Derived : public A_Base {
foo () { } }
class B_Base : A_Base {
bar() { foo() }
}
class B_Derived : public ...
- 359
0
votes
1
answer
42
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sql Alchemy models inheritance
I use Python and SQLAlchemy 2.0.23. My aim is to dynamically create SQLAlchemy models and tables in postgre database based on these models. I have several countries, and these are similar tables for ...
- 1
-3
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1
answer
71
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Hit a snag whilst adding a subclass to std::vector
My idea was initially to create my own custom vector with methods built in for various mathematical calculations, as well as the usual std::vector features, for the sake of regression analysis. I ...
0
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0
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34
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Is anti-pattern to handle redirections and view variables within Cake Components?
I am working on a project with CakePHP 2.x and I found 3 Controllers that share the same logic but some part of that logic is to set view variables and redirections.
class ControllerA
{
public ...
- 50
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0
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99
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What are the benefits and drawbacks of some ways to work around the ambiguous `operator==` issue in C++20 (with CRTP inheritance)?
I have a CRTP base class CRTPBase<Child, T> from which inherits the child class Child<T>. My goal is to be able to compare two values of type Child<T> using operator==. However, I ...
- 3,359
4
votes
2
answers
109
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Passing parameters to parent constructor using Perl's new class syntax
This question concerns Perl's class syntax (new as of Perl 5.38.0). I have two classes, Rectangle and Square, with Square inheriting from Rectangle. They have different constructor arguments; ...
- 16.5k
2
votes
2
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MyPy displays an error when inheriting from str and adding metaclass
Here's simple example of code:
class meta(type): pass
class Test(str, metaclass = meta): pass
When I run mypy on it (just from cli, without any flags or other additional setup) I'm seeing next output:...
- 143
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16
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Derived class as argument of OpenCL kernel function
I am trying to compile the following OpenCL kernel code with clang-16:
clang-16 -cl-std=clc++2021 -c -emit-llvm -target spir64 -Xclang -finclude-default-header \
-o /workspace/test/...
