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Forcing a subclass to provide an initialization method


Forcing a subclass to provide an initialization method

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Forcing a subclass to provide an initialization method
Tag : java , By : ugufugu
Date : November 24 2020, 03:01 PM

wish help you to fix your issue The primary problem with this approach is that even though the subclass is required to implement the initPeople method, there is nothing forcing the subclass to call it in the constructor.
A better approach would be to use the Template design pattern :
public abstract class A 
{
    protected Person[] people;

    public final void execute() 
    {
         initPeople();
         performOperations();
    } 
    protected abstract void initPeople();
    protected abstract void performOperations();
}

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How to provide additional initialization for a subclass of namedtuple?


Tag : python , By : jgood
Date : March 29 2020, 07:55 AM
help you fix your problem edit for 2017: turns out namedtuple isn't a great idea. attrs is the modern alternative.
class Edge(EdgeBase):
    def __new__(cls, left, right):
        self = super(Edge, cls).__new__(cls, left, right)
        self._hash = hash(self.left) * hash(self.right)
        return self

    def __hash__(self):
        return self._hash

forcing to call UIViewController subclass method


Tag : iphone , By : rixtertech
Date : March 29 2020, 07:55 AM
may help you . There is a difference between how you declare your object and what it actually is. Consider this example:
Mammal *mammal = [[Dog alloc] init]; //Dog is a subclass of Mammal
if ([mammal isKindOfClass:[Dog class]]) {
    [(Dog *)mammal bark];
}

Forcing a superclass to call its own method when sender subclass has the same signature


Tag : objective-c , By : Ronnie Carlin
Date : March 29 2020, 07:55 AM
this one helps. There is only one context. There's a single object. Its class is MySubClass.
It is a mistake to have overridden the method with a different incompatible type. Don't do that. This is not C++ with function overloading. There's no dispatch based on the type of arguments.

Forcing a subclass to call its superclass method in Objective-C


Tag : objective-c , By : THD
Date : March 29 2020, 07:55 AM
I hope this helps . There are various ways of doing this. Perhaps the easiest and most straightforward way would be to add __attribute__((objc_requires_super)) to your method declaration:
@interface Vehicle : NSObject
  -(void)logDetails __attribute__((objc_requires_super));
@end

@implementation Car
  -(void) logDetails {
} // WARNING: Method possibly missing a [super logDetails] call
@protocol VehicleLogger <NSObject>

-(void)logDetails;

@end
@implementation Car <VehicleLogger>
-(void)logDetails {
   [super logDetails];
   //Do more stuff here, if I want
}

Java - Alternatives to forcing subclass to have a static method


Tag : java , By : Zinovate
Date : March 29 2020, 07:55 AM
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