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Design Scenario: Smartphone class and will have derived classes like IPhone,AndroidPhone,WindowsMobilePhone can be even


Design Scenario: Smartphone class and will have derived classes like IPhone,AndroidPhone,WindowsMobilePhone can be even

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Design Scenario: Smartphone class and will have derived classes like IPhone,AndroidPhone,WindowsMobilePhone can be even
Tag : java , By : Peter Leung
Date : November 27 2020, 01:01 AM


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In terms of OO design, can two-d and the three-d point classes be derived from single base class?


Tag : development , By : agjimenez
Date : March 29 2020, 07:55 AM
this will help I don't see any reason not to. But if the only difference between Shapes is in the type of Points they contain, why not make the Shape class itself a template, or a "generic" in Java parlance?

What design pattern to use when I want only some derived classes to have access to a method in base class?


Tag : chash , By : bdurbin
Date : March 29 2020, 07:55 AM
I hope this helps . It sounds as though you're missing another abstract class (SpecialChild for want of a better name) that inherits from Parent but from which Child2 and Child3 are derived.
                    Parent
                      | 
   |------------------|------------|----------|
Child1            SpecialChild   Child4    Child5
                      |
         |---------------------|
      Child2                 Child3

Object model design; base class awareness of derived classes


Tag : php , By : Theo
Date : March 29 2020, 07:55 AM
like below fixes the issue Preamble: Is it bad design for a base class to be aware of and make interactions using derived types? I'm assuming not, so what approach should I consider for the following? , You should be able to generalize it:
public function get_ancestor($type){
    if($this->_parent instanceof $type){
        return $this->_parent;
    }
    if(null !== $this->_parent){
        return $this->_parent->get_ancestor($type);
    }
    return null;
}

When using a virtual base class in a multiple inheritance scenario, is it necessary for all derived classes to reference


Tag : cpp , By : John Studdert
Date : March 29 2020, 07:55 AM
wish helps you It semantically identical, since each derived class will have exactly one virtual base of type A. Mentio­ning the virtual base explicitly is quite nice, because the most-derived class constructs the virtual base (unlike what happens for non-virtual bases), and the construction order is important to keep in mind when writing the constructors of the derived classes.
I don't have a technical answer for (2). You don't have to do it, but it would be nice if you did. Like calling your parents, I suppose. As with many things, C++ doesn't force you to be reasonable.

Good design for a reusable class with many derived classes


Tag : cpp , By : mgaspar
Date : March 29 2020, 07:55 AM
I wish this helpful for you
Does this design seem good or are there some glaring holes I haven't accounted for? Or are there other common patterns used in situations like this?
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