All Questions
Tagged with visibility inheritance
64
questions
43
votes
4
answers
212k
views
Calling the base class constructor from the derived class constructor
I have a question:
Say I have originally these classes which I can't change (let's say because they're taken from a library which I'm using):
class Animal_
{
public:
Animal_();
int getIdA()
...
- 1,767
35
votes
7
answers
32k
views
Expose a private Objective-C method or property to subclasses
According to some official talk, a class in Objective-C should only expose public methods and properties in its header:
@interface MyClass : NSObject
@property (nonatomic, strong) MyPublicObject *...
- 5,813
25
votes
3
answers
21k
views
Why can I override a protected method with public method?
The Java compiler doesn't complain when I override a protected method with a public method. What's really happening here? Is it overriding or hiding the parent method since the parent method has lower ...
- 8,092
18
votes
3
answers
3k
views
Why can we reduce visibility of a property in extended class?
I have two classes, Parent:
public class Parent {
public String a = "asd";
public void method() {
}
}
And Child:
public class Child extends Parent{
private String a = "12";
...
- 4,148
14
votes
4
answers
9k
views
Why does PHP allow protected and private methods to be made public via an override in subclasses?
From some brief fiddling about, I find I get an error when overriding superclass methods in a subclass when I do the following:
Override a protected superclass method with a private subclass method
...
- 14.9k
10
votes
3
answers
12k
views
PHP Inherited parent method can't access child's private property
First of all: A quite similar problem has been posted and somehow solved already, but is still not answering my specific problem. More about this later.
In words: I have a base class which provides ...
- 103
8
votes
2
answers
12k
views
Swift 3 access of private properties in a struct from a extension
I've been looking through the swift docs and working through some examples around encapsulation, and am unsure about the behaviour that I'm seeing. I've looked for similar questions on stack, looked ...
- 1,953
6
votes
4
answers
3k
views
Policy inheritance and inaccessible protected members
It seems that a protected member from a template policy class is inaccessible, even with a class hierarchy which seems correct.
For instance, with the following code snippet :
#include <iostream&...
- 2,741
6
votes
3
answers
5k
views
How to prevent usage of public parent methods in child instance in PHP?
So let's say I have classes called parent and child, which will be then used from PHP file called caller.php
class Child extends Parent {
}
class Parent {
public function parentMethod(){
}...
- 4,019
6
votes
1
answer
670
views
Subclassing sun.* class in same package gives IllegalAccessError
Foreword:
What am I going to show you is WRONG and I'm well aware of how bad I am for breaking encapsulation by doing such foolish thing.
I'm not trying to solve any more general I/O problem. It's ...
- 4,886
4
votes
1
answer
600
views
Destructor protection in abstract base class is not inherited in C++?
I found a memory leak in my code that was caused by calling only the base class destructor for objects. This problem is understood: I already added the virtual to the destructor of the interface class ...
- 9,965
4
votes
2
answers
4k
views
Only allow some classes to call a method in Java
Lets say I have a structure like this:
Object A contains an instance of Object B
Object B contains an instance of Object C
Object D extends Object C
I have an instance of object D that other ...
- 2,539
3
votes
5
answers
7k
views
Java Protected Access Not Working
In java, there's three levels of access:
Public - Open to the world
Private - Open only to the class
Protected - Open only to the class and its subclasses (inheritance).
So why does the java ...
- 1,427
3
votes
1
answer
128
views
Making an instance method inaccessible from a subclass
Given:
class Base
def foo
puts 'foo!!!'
end
end
class Ball < Base
end
I want:
Ball.new.foo to return an error: No Method Found.
Base.new.foo to return: foo!!!.
My attempts are:
I ...
- 6,533
3
votes
1
answer
3k
views
child class accessing parent's private method?
A user posted a comment on PHP Visibility manual page. It's the second most voted comment. He used this code example:
<?php
abstract class base {
public function inherited() {
$this-&...
- 627