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
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Is List<Dog> a subclass of List<Animal>? Why are Java generics not implicitly polymorphic?
I'm a bit confused about how Java generics handle inheritance / polymorphism.
Assume the following hierarchy -
Animal (Parent)
Dog - Cat (Children)
So suppose I have a method doSomething(List<...
- 82.1k
140
votes
2
answers
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views
Prototypical inheritance - writing up [duplicate]
So I have these 2 examples, from javascript.info:
Example 1:
var animal = {
eat: function() {
alert( "I'm full" )
this.full = true
}
}
var rabbit = {
jump: function() { /* something */...
- 6,609
1995
votes
36
answers
496k
views
Prefer composition over inheritance?
Why prefer composition instead of inheritance? What trade-offs are there for each approach? And the converse question: when should I choose inheritance instead of composition?
- 351k
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What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
The API Reference Scope page says:
A scope can inherit from a parent scope.
The Developer Guide Scope page says:
A scope (prototypically) inherits properties from its parent scope.
So, does a ...
- 364k
330
votes
7
answers
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How can you represent inheritance in a database? [closed]
I'm thinking about how to represent a complex structure in a SQL Server database.
Consider an application that needs to store details of a family of objects, which share some attributes, but have ...
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3
answers
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Why do I have to access template base class members through the this pointer?
If the classes below were not templates I could simply have x in the derived class. However, with the code below, I have to use this->x. Why?
template <typename T>
class base {
protected:
...
- 57.8k
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votes
7
answers
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views
Understanding Python super() with __init__() methods [duplicate]
Why is super() used?
Is there a difference between using Base.__init__ and super().__init__?
class Base(object):
def __init__(self):
print "Base created"
class ChildA(...
- 51.9k
405
votes
8
answers
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views
What's wrong with overridable method calls in constructors?
I have a Wicket page class that sets the page title depending on the result of an abstract method.
public abstract class BasicPage extends WebPage {
public BasicPage() {
add(new Label("...
- 91.3k
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votes
29
answers
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Why not inherit from List<T>?
When planning out my programs, I often start with a chain of thought like so:
A football team is just a list of football players. Therefore, I should represent it with:
var football_team = new ...
- 26.2k
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What are the differences between type() and isinstance()? [duplicate]
What are the differences between these two code snippets?
Using type:
import types
if type(a) is types.DictType:
do_something()
if type(b) in types.StringTypes:
do_something_else()
Using ...
- 27.8k
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views
What is the difference between public, private, and protected inheritance?
What is the difference between public, private, and protected inheritance in C++?
user106599
754
votes
11
answers
304k
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What does 'super' do in Python? - difference between super().__init__() and explicit superclass __init__()
What's the difference between:
class Child(SomeBaseClass):
def __init__(self):
super(Child, self).__init__()
and:
class Child(SomeBaseClass):
def __init__(self):
SomeBaseClass....
- 7,551
251
votes
15
answers
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Convert List<DerivedClass> to List<BaseClass>
While we can inherit from base class/interface, why can't we declare a List<>
using same class/interface?
interface A
{ }
class B : A
{ }
class C : B
{ }
class Test
{
static void Main(...
- 21.8k
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votes
6
answers
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Why do Python classes inherit object?
Why does the following class declaration inherit from object?
class MyClass(object):
...
- 17.8k