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What reasons are there to pass an argument to an initializer in objective C?


What reasons are there to pass an argument to an initializer in objective C?

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What reasons are there to pass an argument to an initializer in objective C?
Tag : objective-c , By : Francis
Date : November 24 2020, 03:41 PM


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Is it possible to pass a method as an argument in Objective-C?


Tag : objective-c , By : snapshooter
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further NSInvocation is a class for wrapping up a method calls in an object. You can set a selector (method signature), set arguments by index. You can then set a target and call invoke to trigger the call, or leave the target unset and use invokeWithTarget: in a loop of some sort to call this on many objects.
I think it works a little like this:
NSInvocation *inv = [[NSInvocation alloc] init];
[inv setSelector:@selector(foo:bar:)];
[inv setArgument:123 atIndex:0];
[inv setArgument:456 atIndex:1];

for (MyClass *myObj in myObjects) {
  [inv invokeWithTarget:myObj];
}
-(void)fooWithMethod:(SEL)selector;

How to pass an initializer list as a function argument?


Tag : cpp , By : Ari
Date : March 29 2020, 07:55 AM
wish of those help Basically, I'm looking to do something like this: , Write a wrapper, then.
DWORD wait_for_multiple_objects(
    std::initializer_list<HANDLE> handles,
    bool wait_all = false, DWORD time = INFINITE
) {
    return WaitForMultipleObjects(
        handles.size(), &*handles.begin(), wait_all, time
    );
}
wait_for_multiple_objects({ handle1, handle2, handle3 });

How to pass brace enclosed initializer list as an argument?


Tag : c , By : Pip
Date : March 29 2020, 07:55 AM
should help you out This is a copy of the this post: Brace Enclosed Initializer List As Function Argument, though I am looking for a solution using only methods available in C. I am using the Windows 8 compiler. , C99 provides compound literals, which would give you what you want:
WaitForMultipleObjects( 3,
                        (HANDLE*){hThread1, hThread2, hThread3},
                        FALSE,
                        INFINITE );
WaitForMultipleObjects( 3,
                        HandleList(3, hThread1, hThread2, hThread3),
                        FALSE,
                        INFINITE );

Designated initializer and convenience initializer in objective-c and how to properly create them and tie them together


Tag : ios , By : Habikki
Date : March 29 2020, 07:55 AM
this one helps. I am trying to understand which should be designated initializer and which one convenience initializer. I read apple docs on that topic but i am still not sure. Does the designated initializer has to have all the values that requires for the class? For example , According to Apple Documentation, the designated initalizer
/**
 Convenience initializers
*/
- (id)init
{
    self = [self initwithCardCount:kDefaultCardCount usingDeck:[Deck defaultDeck] cardMatchMode:kCardMatchModeDefault];
    return self;
}

- (id)initWithCardCount:(NSUInteger)cardCount usingDeck:(Deck *)deck
{
    self = [self initwithCardCount:cardCount usingDeck:deck cardMatchMode:kCardMatchModeDefault]; 
    if (self) {

    }

    return self;
}

/**
 Designated initializer
*/
- (id)initwithCardCount:(NSUInteger)cardCount usingDeck:(Deck *)deck cardMatchMode:(NSUInteger)matchMode
{
    self = [super init];
    if (self) {
        for (int i = 0; i <= cardCount; i++) {
            Card *card = [deck drawRandomCard];
            if (!card) {
                self = nil;
                break;
            }
            else {
                self.cards[i] = card;
            }
        }
        // Set card match mode here:
        _cardMatchMode = matchMode;
    }

    return self;
}

Python (multiprocessing): How to pass a dictionary as the argument of a worker process initializer function?


Tag : python , By : OllieDoodle
Date : March 29 2020, 07:55 AM
it should still fix some issue if you look at the documentation here
you will see the following:
If initializer is not None then each worker process will   
call initializer(*initargs) when it starts.  
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