[**`super`**][1]

Essentially, it allows you to use the implementations of the current class&#39; superclass.

For the [gritty][2] [details][3] of the Objective-C runtime:

`[super message]` has the following meaning:

&gt; When it encounters a method call, the
&gt; compiler generates a call to one of
&gt; the functions objc_msgSend,
&gt; objc_msgSend_stret, objc_msgSendSuper,
&gt; or objc_msgSendSuper_stret. Messages
&gt; sent to an object’s superclass (using
&gt; the super keyword) are sent using
&gt; objc_msgSendSuper; other messages are
&gt; sent using objc_msgSend. Methods that
&gt; have data structures as return values
&gt; are sent using objc_msgSendSuper_stret
&gt; and objc_msgSend_stret.

So yes, it is static, and **not** determined at runtime.

  [1]: http://developer.apple.com/mac/library/documentation/cocoa/conceptual/objectivec/Articles/ocDefiningClasses.html#//apple_ref/doc/uid/TP30001163-CH12-BAJHDGAC
  [2]: http://developer.apple.com/mac/library/documentation/cocoa/reference/objcruntimeref/Reference/reference.html#//apple_ref/c/tag/objc_super
  [3]: http://developer.apple.com/mac/library/documentation/cocoa/reference/objcruntimeref/Reference/reference.html#//apple_ref/c/func/objc_msgSendSuper

It&#39;s a keyword that&#39;s equivalent to `self`, but starts its message dispatch searching with the superclass&#39;s method table.

`super` is *not* a pointer to a class.  Super is `self`, but when used in a message expression, it means &quot;look for an implementation starting with the superclass&#39;s method table.&quot;

These blog postings on [what is a meta class?][1], [getting subclasses][2] and [classes and metaclasses][3] may give you some insight on the internals of this.


  [1]: http://cocoawithlove.com/2010/01/what-is-meta-class-in-objective-c.html
  [2]: http://cocoawithlove.com/2010/01/getting-subclasses-of-objective-c-class.html
  [3]: http://www.sealiesoftware.com/blog/archive/2009/04/14/objc_explain_Classes_and_metaclasses.html

I want to have an image on the title in an HTML page (i.e on the tab along with the title). How can I do that?


HTML Title Image

I&#39;m trying to make my integration tests more idempotent.  One idea was to execute rollback after every test, the other idea was to some how programatically parse the text, similar to the green check box in Query Analyzer or SSMS.

How do I get SQL Server to parse my command without running it using ADO.NET?

**UPDATE:** 
This is what finally worked as desired:

    using (DbCommand executeOnly = Factory.DbCommand())
    {
        executeOnly.Connection = command.Connection;
        executeOnly.CommandType = CommandType.Text;
        executeOnly.CommandText = &quot;SET NOEXEC ON;&quot; + sqlCommand;
        executeOnly.Connection.Open();
        executeOnly.ExecuteNonQuery();
    }
    //set more properties of command.
    command.Execute();

For inexplicable reasons, &quot;`SET PARSEONLY ON`&quot; only worked in Query Analyzer.  I couldn&#39;t set this on an ADO.NET connection.  It is just as well because `PARSEONLY` seems to catch only syntax errors, which isn&#39;t a common error.  `SET NOEXEC ON` will catch a wider varieties of errors, such as a view that references a missing table or column or a missing parameter in a stored procedure.

How can I programmatically check (parse) the validity of a TSQL statement?

As far as I know, it&#39;s a pointer to the superclass. It&#39;s hard-wired with the superclass, and not dynamically figured out at runtime. Would like to know it more in detail...

Anyone?

What exactly is super in Objective-C?

<p>As far as I know, it's a pointer to the superclass. It's hard-wired with the superclass, and not dynamically figured out at runtime. Would like to know it more in detail...</p>
<p>Anyone?</p>


I&#39;m trying to create a custom UIMenuController and display it in my view. Here&#39;s my code:

    UIMenuController *menuController = [UIMenuController sharedMenuController];
    	UIMenuItem *listMenuItem = [[UIMenuItem alloc] initWithTitle:@&quot;List&quot; action:@selector(addList:)];
    	
    	[menuController setMenuItems:[NSArray arrayWithObject:listMenuItem]];
    	[menuController setTargetRect:CGRectMake(50.0, 50.0, 0, 0) inView:self.view];
    	[menuController setMenuVisible:YES animated:YES];
    	
    	[listMenuItem release];

There are no errors or exceptions, but the menu controller just doesn&#39;t show up.

UIMenuController not showing up

&gt; **Possible Duplicate:**  
&gt; [Best practices for validating email address in Objective-C on iOS 2.0?](https://stackoverflow.com/questions/800123/best-practices-for-validating-email-address-in-objective-c-on-ios-2-0)  

&lt;!-- End of automatically inserted text --&gt;

I am developing an iPhone application where I need the user to give his email address at login.

What is the best way to check if an email address is a valid email address?


Check that an email address is valid on iOS

I was using a `NSMutableArray` and realized that using a dictionary is a lot simpler for what I am trying to achieve.

I want to save a key as a `NSString` and a value as an `int` in the dictionary. How is this done?  Secondly, what is the difference between mutable and a normal dictionary?

How to add to an NSDictionary

Is there an option to turn off the sound on the iPhone Simulator?
Or to adjust the volume?

Turn off sound in iPhone Simulator

I&#39;m trying to make a high score table, and suck at arrays in objective c (actually, in general objective c is challenging for me), so I can&#39;t figure out how to sort. I&#39;m trying to do something like this (speudocode, I&#39;m writing this in actionscript style because I&#39;m more comfortable with it):

    highscores.addObjecttoArray(score)
    highscores.sort(ascending)

But I can&#39;t figure it out... I&#39;ve seen other threads about it, but their use plist files and stuff and I don&#39;t know enough objective c to learn from them.

How Do I sort an NSMutable Array with NSNumbers in it?

Let&#39;s say I have a base class named `Entity`.  In that class, I have a static method to retrieve the class name:

    class Entity {
        public static String getClass() {
            return Entity.class.getClass();
        }
    }

Now I have another class extend that.

    class User extends Entity {
    }

I want to get the class name of User:

    System.out.println(User.getClass());

My goal is to see &quot;com.packagename.User&quot; output to the console, but instead I&#39;m going to end up with &quot;com.packagename.Entity&quot; since the Entity class is being referenced directly from the static method.

If this wasn&#39;t a static method, this could easily be solved by using the `this` keyword within the `Entity` class (i.e.: `return this.class.getClass()`).  However, I need this method to remain static.  Any suggestions on how to approach this?

Getting the name of a sub-class from within a super-class

Is `super()` used to call the parent constructor?
Please explain `super()`.

super() in Java

I&#39;m currently learning about class inheritance in my Java course and I don&#39;t understand when to use the `super()` call?

Edit:  
I found this example of code where &lt;code&gt;super.*variable*&lt;/code&gt; is used:

    class A
    {
        int k = 10;
    }
    
    class Test extends A
    {
    	public void m() {
    		System.out.println(super.k);
    	}
    }


So I understand that here, you must use `super` to access the `k` variable in the super-class. However, in any other case, what does `super();` do? On its own?


When do I use super()?

I was wondering, when creating new `Activity` classes and then overriding the `onCreate()` method, in eclipse I always get auto added: `super.onCreate()`. How does this happen? Is there a java keyword in the abstract or parent class that forces this?

I don&#39;t know if it is illegal not to call the super class, but I remember in some methods that I got a exception thrown for not doing this. Is this also built-in into java? Can you use some keyword to do that? Or how is it done?

How to force derived class to call super method? (Like Android does)

    public class SuperClass
    {
    	public void method1()
    	{
    		System.out.println(&quot;superclass method1&quot;);
    		this.method2();
    	}
    	
    	public void method2()
    	{
    		System.out.println(&quot;superclass method2&quot;);
    	}
    		
    }
    
    public class SubClass extends SuperClass
    {
    	@Override
    	public void method1()
    	{
    		System.out.println(&quot;subclass method1&quot;);
    		super.method1();
    	}
    	
    	@Override
    	public void method2()
    	{
    		System.out.println(&quot;subclass method2&quot;);
    	}
    }
    
    
    
    public class Demo 
    {
    	public static void main(String[] args) 
    	{
    		SubClass mSubClass = new SubClass();
    		mSubClass.method1();
    	}
    }

my expected output:

&gt; subclass method1  
&gt; superclass method1  
&gt; superclass method2  

actual output:

&gt; subclass method1  
&gt; superclass method1  
&gt; subclass method2


I know technically I have overriden a public method, but I figured that because I was calling the super, any calls within the super would stay in the super, this isn&#39;t happening. Any ideas as to how I can make it happen?


Java: Calling a super method which calls an overridden method

Background: CamelBones registers Perl classes with the Objective-C runtime.
To do this, every Perl method is registered with the same IMP
function; that function examines its `self` &amp; `_cmd` arguments to find
which Perl method to call.

This has worked well enough for several years, for messages that were
dispatched with `objc_msgSend`. But now I want to add support for
returning floating-point and large struct types from Perl methods.
Floating-point isn&#39;t hard; I&#39;ll simply write another IMP that returns
double, to handle messages dispatched with `objc_msgSend_fpret`.

The question is what to do about `objc_msgSend_stret`. Writing a
separate `IMP` for every possible struct return type is impractical, for
two reasons: First, because even if I did so only for struct types
that are known at compile-time, that&#39;s an absurd number of functions.
And second, because we&#39;re talking about a framework that can be linked against any arbitrary Objective-C &amp; Perl code, we *don&#39;t* know all the potential struct types when the framework is being compiled.

What I hope to do is write a single `IMP` that can handle any return
type that&#39;s dispatched via `objc_msgSend_stret`. Could I write it as
returning `void`, and taking a pointer argument to a return buffer, like
the old `objc_msgSend_stret` was declared? Even if that happened to
work for now, could I rely on it continuing to work in the future?

Thanks for any advice - I&#39;ve been racking my brain on this one. :-)

**Update:**

Here&#39;s the advice I received from one of Apple&#39;s runtime engineers, on their objc-language mailing list:

&gt; You must write assembly code to handle
&gt; this case.
&gt; 
&gt; Your suggestion fails on some
&gt; architectures, where ABI for &quot;function
&gt; returning void with a pointer to a
&gt; struct as the first argument&quot; differs
&gt; from &quot;function returning a struct&quot;.
&gt; (On i386, the struct address is popped
&gt; from the stack by the caller in one
&gt; case and by the callee in the other
&gt; case.) That&#39;s why the prototype for
&gt; `objc_msgSend_stret` was changed.
&gt; 
&gt; The assembly code would capture the
&gt; struct return address, smuggle it into
&gt; non-struct-return C function call
&gt; without disturbing the rest of the
&gt; parameters, and then do the right
&gt; ABI-specific cleanup on exit (`ret $4`
&gt; on i386). Alternatively, the assembly
&gt; code can capture all of the
&gt; parameters. The forwarding machinery
&gt; does something like this. That code
&gt; might be in open-source CoreFoundation
&gt; if you want to see what the techniques
&gt; look like.

I&#39;ll leave this question open, in case someone brainstorms a better idea, but with this coming directly from Apple&#39;s own &quot;runtime wrangler,&quot; I figure it&#39;s probably as authoritative an answer as I&#39;m likely to get. Time to dust off the x86 reference manuals and knock the rust off my assembler-fu, I guess...

How to implement an IMP function that returns a large struct type determined at run-time?

In a project I have taken on, the original author has opted to use `objc_setAssociatedObject()` and I&#39;m not 100% clear what it does or why they decided to use it.

I decided to look it up and, unfortunately, the docs aren&#39;t very descriptive about its purpose.

**objc_setAssociatedObject**  
Sets an associated value for a given object using a given key and association policy.  
`void objc_setAssociatedObject(id object, void *key, id value, objc_AssociationPolicy policy)`  
**Parameters**  
`object`  
The source object for the association.  
`key`  
The key for the association.  
`value`  
The value to associate with the key key for object. Pass nil to clear an existing association.  
`policy`  
The policy for the association. For possible values, see “Associative Object Behaviors.”  

So what exactly does this function do and in what cases should it be used?
_____________

*Edit after reading answers*

So what is the point in the following code?

    Device *device = [self.list objectAtIndex:[indexPath row]];
    DeviceViewController *next = [[DeviceViewController alloc] initWithController:self.controller
    																			device:device
    																			   item:self.rootVC.selectedItem];	
    	objc_setAssociatedObject(device, &amp;kDeviceControllerKey, next, OBJC_ASSOCIATION_RETAIN);

What is the point in associating the device with the view controller if it&#39;s already an instance variable?

What is objc_setAssociatedObject() and in what cases should it be used?

I read here [Learn C Before Objective-C?](https://stackoverflow.com/questions/180549/learn-c-first-before-learning-objective-c)

&gt;Usually I then replace some Obj-C code with pure C code (after all you can mix them as much as you like, the content of an Obj-C method can be entirely, pure C code)

Is this true? 

Is it possible to build an iPhone app purely in the C programming language?

How to write iOS app purely in C

I tested out some [isa swizzling][1] with Swift, and found that it only works when NSObject is a super-class (directly or further up), or by using the &#39;@objc&#39; decoration. Otherwise it will follow a static- and vtable-dispatch style, like C++. 

Is it normal to define a Swift class without a Cocoa/NSObject base class? If it is I&#39;m concerned this means foregoing much of the dynamism of Objective-C, such as method interception and run-time introspection. 

Dynamic run-time behavior sits at the heart of features like property observers, Core Data, [Aspect Oriented Programming][2], [Higher Order Messaging][3], analytical &amp; logging frameworks and so on. 

Using Objective-C&#39;s style of method invocation adds around 20 machine code operands to a method call, so in certain situations (*many tight calls to methods with small bodies*) C++ style static and vtable dispatch can perform better. 

But given the general 95-5 rule (*95% of performance gains come from tuning 5% of the code*), doesn&#39;t it makes sense to start with the powerful dynamic features and harden where necessary? 



  [1]: https://stackoverflow.com/q/24050500/404201
  [2]: http://en.wikipedia.org/wiki/Aspect-oriented_programming
  [3]: http://en.wikipedia.org/wiki/Higher_order_message
  [4]: http://en.wikipedia.org/wiki/Late_binding
  [5]: https://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Proxy.html
  [6]: https://github.com/cglib/cglib

Swift native base class or NSObject

I have a project that has a dependency (installed via CocoaPods) using SocketRocket and have imported a static library from HeapAnalytics. Apparently the HeapAnalytics library already uses SocketRocket. I get no errors when compiling, but at runtime receive the following:

    Class SRWebSocket is implemented in both [path] and [path].
    One of the two will be used. Which one is undefined.

I&#39;m not sure how to handle it because most solutions I&#39;ve seen require compiling the static library yourself change class names and such, and I don&#39;t have access to the source.

Any recommendations?

Content Type	Original Author	Original Content on Stackoverflow
Question	dontWatchMyProfile	View Question on Stackoverflow
Solution 1 - Objective C	Ben S	View Answer on Stackoverflow
Solution 2 - Objective C	Chuck	View Answer on Stackoverflow
Solution 3 - Objective C	NSResponder	View Answer on Stackoverflow
Solution 4 - Objective C	David Gelhar	View Answer on Stackoverflow

What exactly is super in Objective-C?

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Solution 2 - Objective C

Solution 3 - Objective C

Solution 4 - Objective C

How can I programmatically check (parse) the validity of a TSQL statement?

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