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C# casting to parent still running child methods


C# casting to parent still running child methods

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C# casting to parent still running child methods
Tag : chash , By : Florian D.
Date : September 15 2020, 12:00 AM

hop of those help? You basically can't (short of using tricks with reflection). That's how inheritance in C# works.
What you could do instead of overriding Run is to shadow it:
public class Parent
{
    public void Run() => Console.WriteLine("Parent");
}

public class Child : Parent
{
    public new void Run() => Console.WriteLine("Child");
}

var child = new Child();
child.Run(); // prints "Child"
((Parent)child).Run(); // prints "Parent"

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Java Android - Casting Parent to Child to Child


Tag : java , By : Michael
Date : March 29 2020, 07:55 AM
help you fix your problem unless the view are inflating is actually an ActivityMonitorItemView then you will get the exception. You must in your xml file, give the full name of your class. So instead of LinearLayout it would be like
<com.example.ActivityMonitorItemView
  android:layout_width="wrap_content"
  android:layout_height="wrap_conetent"
  android:id="@+id/tester"/>

Is casting Child to Parent fine?


Tag : java , By : Verbal
Date : March 29 2020, 07:55 AM
hope this fix your issue Yes. You can cast Child to a Parent since every Child is Parent. That's the beauty of OOP.

When chaining methods can the child method access and use the results of the 'parent' method? (i.e. Object.parent.child)


Tag : ruby-on-rails , By : akr
Date : March 29 2020, 07:55 AM
it helps some times I get what you're trying to do, almost like a command-line pipe operation. And, no, not possible with your approach (or, IMHO, recommended).
Consider the demo method:
def demo
  @demo
  self
end
def demo
  @group = @demo
  self
end
report.live.add_money_to_gross(money)
report.add_money_to_gross(money)
class ReportItemArray < Array
  def add_money_to_net money
    item = find_item(money)
    if item
      item.net += money
    else
      self << ReportItem.new(currency: money.currency.to_s, net: money)
    end
  end
  def add_money_to_gross money
    item = find_item(money)
    if item
      item.gross += money
    else
      self << ReportItem.new(currency: money.currency.to_s, gross: money)
    end
  end
  def find_item money
    self.find {|s| s.currency == money.currency }
  end
end
class Report
  def initialize
    @demo = ReportItemArray.new
    @live = ReportItemArray.new
  end
  def live
    @live
  end
  def demo
    @demo
  end
end
report.live.add_money_to_gross(money)

statically casting parent to child C++


Tag : cpp , By : jehammon
Date : March 29 2020, 07:55 AM
I hope this helps . I have a parent class and a child class which has a function specific to it that the parent class does not have. I create a vector of type Parent and add an object of type Child to it. I know for sure that said item is a child, so I attempt to use a static_cast to create a pointer to it in order to use its child specific function, but it refuses to convert giving the error described in the code below. ,
Why is this happening
int main()
{
    //I know for a fact that the item is a child
    std::vector<Parent> items;
    items.push_back(Child()); // <<<< You are copying and slicing here

    //Static cast to use child specific function doesn't work
    Child* childPtr = static_cast<Child*>(items[0]);
    childPtr->childSpecificFunction(); // <<<<< undefined behavior

    //Gives intellisence error: no suitable conversion from "Parent" to "Child *" exists
}
int main()
{
    std::vector<std::unique_ptr<Parent>> items;
    items.push_back(std::make_unique<Child>());  // <<< working with pointers,
                                                 //     no slicing.

    Child* childPtr = static_cast<Child*>(items[0].get());
    childPtr->childSpecificFunction();
 }

InvalidCastException when casting from child to parent


Tag : chash , By : Matthew Steed
Date : March 29 2020, 07:55 AM
Any of those help Your IRepository<> interface needs to be covariant, via out in its generic declaration:
public interface IRepository<out T>{ ... }
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