Access level modifiers determine whether other classes can use a particular field or invoke a particular method.
Questions tagged [access-levels]
77 questions
70
votes
7 answers
How to restrict access to nested class member to enclosing class?
Is it possible to specify that members of a nested class can be accessed by the enclosing class, but not other classes ?
Here's an illustration of the problem (of course my actual code is a bit more complex...) :
public class Journal
{
public…
Thomas Levesque
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34
votes
6 answers
Are protected members/fields really that bad?
Now if you read the naming conventions in the MSDN for C# you will notice that it states that properties are always preferred over public and protected fields. I have even been told by some people that you should never use public or protected…
ryanzec
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29
votes
3 answers
Why can't extensions with protocol conformances have a specific access level?
Assume we have the following example code:
protocol MyProtocol {
func someFunction()
}
public class MyClass {
}
public extension MyClass: MyProtocol {
func someFunction() {
print("hello")
}
}
Compiling the code above gives…
Paolo
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17
votes
9 answers
Common CMS roles and access levels
I am currently writing a CMS and remember someone (it might have been on here) criticise the existing CMS for not having a robust enough user permissions system. I've got a method planned out but it I feel it has fallen into the usual trap of being…
Meep3D
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11
votes
1 answer
"temporary of type 'A' has protected destructor", but its type is B
In the following code, compiled with Clang 8.0.0+ and -std=c++17, creating a derived class instance using B{} gives an error error: temporary of type 'A' has protected destructor. Why is A appearing in this message when the temporary has type B (and…
jtbandes
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11
votes
7 answers
What is the difference between private and fileprivate in Swift 4
In Swift 4, since now private is visible in extensions also in the same source code file, how is it different from the fileprivate access modifier?
Background: In Swift 3, private variables in a class are not visible in its extensions in the same…
crypt
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11
votes
2 answers
Difference between fileprivate and private extension?
Swift 3.0
I know that fileprivate access level modifier limited using of function/property to source file where it was declared and private - limited to lexical scope where was declared. But it seems that this rule not apply for extensions. E.G.…
Bohdan Savych
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8
votes
5 answers
What do you choose, protected or internal?
If I have a class with a method I want protected and internal. I want that only derived classes in the assembly would be able to call it.
Since protected internal means protected or internal, you have to make a choice. What do you choose in this…
brickner
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7
votes
2 answers
How to hide a protected procedure of an object?
In one base class, there's a protected procedure. When inheriting that class, I want to hide that procedure from being used from the outside. I tried overriding it from within the private and even strict private sections, but it can still be called…
Jerry Dodge
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7
votes
3 answers
Is there a language with object-based access levels?
A common misconception about access level in Java, C#, C++ and PHP is that it applies to objects rather than classes. That is, that (say) an object of class X can't see another X's private members. In fact, of course, access level is class-based…
Carl Manaster
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5
votes
2 answers
Why do I get an "Access Level must be protected or weaker" after extending a protected class variable and marking it private?
abstract class AbstractController
{
protected $repository;
}
class GraphController extends AbstractController
{
private $repository;
}
I get this error:
Fatal error: Access level to GraphController::$repository must be protected or weaker…
Dennis
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5
votes
2 answers
Rails authlogic : How to make Levels?
I followed this tutorial for setting Autlogic up properly. So, my site needs a form of level, like "Admin", "Moderator", "User", "Guest". So Admins can do everything, where Moderators may not can make site changes. And Users can't destroy, Update or…
Oluf Nielsen
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5
votes
4 answers
access exception when invoking method of an anonymous class using java reflection
I'm trying to use an event dispatcher to allow a model to notify subscribed listeners when it changes. the event dispatcher receives a handler class and a method name to call during dispatch. the presenter subscribes to the model changes and provide…
Asaf David
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5
votes
8 answers
C# protected field to private, add property--why?
In Visual Studio 2008 Team System, I just ran Code Analysis (from the Analyze menu) on one of my C# projects. One of the warnings produced was the following:
Microsoft.Design : Because field 'Connection._domain' is visible outside of its declaring…
Sarah Vessels
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4
votes
1 answer
Swift: Calling function from a different target
I have two targets (Target A, Target B) and from Target B I would like to call a function which is located in Target A. I get the Use of Unresolved Identifier error when trying to compile as expected since ClassA.swift isn't part of Target B. So I…
Bhavik Patel
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