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Can I force a C++ class to be non-abstract?


Can I force a C++ class to be non-abstract?

By : Beans
Date : November 20 2020, 03:01 PM
this will help In some IDEs, notably Visual Studio, the "Errors" window only shows you the first line of each error. If you look at the compiler output, it'll show you additional information, if available; in this situation, that information would include what members were missing (and you can double-click on the line of output to go to the associated line of code). I'm not aware of any recent compiler which doesn't tell you which abstract functions were unimplemented.
code :


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Can an abstract class force the inheriting class to implement a method as static?

Can an abstract class force the inheriting class to implement a method as static?


By : user3868598
Date : March 29 2020, 07:55 AM
I hope this helps you . I think some clarification is needed;
First, in Python every method is virtual - really virtual; so whether a method is static, or bound to a class or instance, that's a matter of the subclass, not of the parent one. You don't have a real reason for wanting to prevent that - what's your purpose?
code :
import abc

class SomeAbstractClass(metaclass=abc.ABCMeta):

    @abc.abstractstaticmethod
    def some_method(): 
        return 123

class ValidConcreteClass1(SomeAbstractClass):

    def some_method(self):
        return 456

inst = ValidConcreteClass1()
print(inst.some_method())
print(SomeAbstractClass.some_method())
class NotWorking(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    @staticmethod
    def some_method(self):
        return "asd"
Is there a way to force a derived class to implement an abstract class or an interface nested in base class?

Is there a way to force a derived class to implement an abstract class or an interface nested in base class?


By : Ganny
Date : March 29 2020, 07:55 AM
I wish this help you I have this abstract class: , You can use a generic
code :
public abstract class Options{};

public class CopyOptions : Options
{
}

public abstract class Task<T> where T : Options
{
  public string ID {get; set;}
  public string Name {get; set;}

  public T Options { get; set; }

  public abstract void Execute();
}

public class Copy : Task<CopyOptions>
{
    public override void Execute()
    {
        Console.Write("running");
    }
}
c# interface, abstract class, force inherited class not abstract class

c# interface, abstract class, force inherited class not abstract class


By : ealker
Date : March 29 2020, 07:55 AM
will help you You have to implement the interface within that class that implements your interface, even if your class is abstract. However you can make your implementation of that method also abstract which forces all deriving classes to implement it:
code :
public abstract Class MyBase : ICanWork
{
     public abstract void DoSomething();
}
public class House : MyBase
{
    public override void DoSomething() { ... }
}
Force a Class Method Parameter to be a Constant From an Abstract Class

Force a Class Method Parameter to be a Constant From an Abstract Class


By : user1390661
Date : March 29 2020, 07:55 AM
like below fixes the issue It's not possible to do this with type-hinting, unfortunately. Type hints can only operate at the level of class, interface or scalar-type level.
Commonly, this pattern is achieved by giving your class a list of "known" constants, which you can then check either via a method on the same class, or a simple in_array check if you make the list public. So you might add the following to the RestAcceptType class:
code :
public static function isValidAcceptType($type)
{
    return in_array($type, [
        self::xml,
        self::html,
        self::json,
        self::text,
    ]);
}
if (!RestAcceptType::isValidAcceptType($acceptType)) {
  throw new InvalidArgumentException;
}
How to force implementation of a nested abstract class in an abstract class in Java?

How to force implementation of a nested abstract class in an abstract class in Java?


By : Kumaran
Date : March 29 2020, 07:55 AM
To fix the issue you can do If I read your question correctly, where you want each sub-class of A to CONTAIN a subclass of B, there is not a direct way to do this. However, you could do something like the below:
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