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How to override Parent class using new object?


How to override Parent class using new object?

By : Ibrahim Anis
Date : November 15 2020, 06:54 AM
will help you First of all, in order to override methods of a class, your class must extend that class :
code :
abstract class ChildMessage extends ParentMessage


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How to override a static property of a parent object and let the parent object access the new value in PHP?

How to override a static property of a parent object and let the parent object access the new value in PHP?


By : user2156286
Date : March 29 2020, 07:55 AM
like below fixes the issue You are looking for Late Static Binding.
So you need to use:
code :
static::$databaseTable
self::$databaseTable
ExtJS, how to override parent class button names and handlers from child class

ExtJS, how to override parent class button names and handlers from child class


By : user3725926
Date : March 29 2020, 07:55 AM
hop of those help? Why simply not create your child-specific buttons in initComponent, for example:
code :
childPanel = Ext.extend(MyUi.ParentPanel, {
    initComponent: function() {
        var items = [panel1, panel2];
        Ext.apply( this, {
            items: items
        });
        this.buttons = [{
            text: "Next", 
            id: "card-next", 
            handler:  function(){
               //your new handler here
            }
        },{
            text: "Previous", 
            id: "card-prev", 
            handler: function(){
                Ext.getCmp('card-id').navigationHandler(-1);
            },
            disabled: true
        },{
            text: "Complete", 
            id: "finishButton", 
        }];
        Cx.Ui.ProvisionRPoolWizardPanel.superclass.initComponent.apply(this);
});
How to have child override values of parent class, but use parent's method

How to have child override values of parent class, but use parent's method


By : birjukumar
Date : March 29 2020, 07:55 AM
Hope that helps If you want to leverage Java's polymorphism, you'll have to involve class instances. Static members cannot display polymorphic behavior, which you apparently require from AdultClass.getA().
Cannot override virtual methods from parent class resulting on error "cannot allocate an object of abstract type&qu

Cannot override virtual methods from parent class resulting on error "cannot allocate an object of abstract type&qu


By : nasir zaka
Date : March 29 2020, 07:55 AM
hope this fix your issue Your attempt to implement the virtual methods of GameState in Menu failed to include the right number of arguments. They are each missing the Tile *tiles[] argument.
This means Menu is implementing three different methods, none of which override the GameState virtual methods. Thus the compiler error.
Compare the object type of a class that inherits from a parent class but stored in vector of parent class

Compare the object type of a class that inherits from a parent class but stored in vector of parent class


By : Spencer
Date : March 29 2020, 07:55 AM
it should still fix some issue You can use type traits for your classes, but if you need a simple (quick and dirty, maybe) solution, you may do it as follows:
code :
#include <string>
#include <iostream>
#include <vector>
#include <typeinfo>
using namespace std;

class Agent{
public:
    static const string TYPE;
    explicit Agent(const string& nam) : name(nam) {}
    virtual ~Agent(){}

    virtual string type() const {
        return TYPE;
    }
protected:
    string name;
};

const string Agent::TYPE = "Agent";

class Human :public Agent {
public:
    static const string TYPE;
    Human(const string& nam, int a):Agent(nam), age(a) {}
    ~Human(){}

    virtual string type() const {
        return TYPE;
    }
protected:
    int age;
};

const string Human::TYPE = "Human";


int main(){
    vector<Agent*> agents;
    Agent* agent=new Agent("ask");
    Human* human=new Human("ask2",18);
    Agent* agent2=new Human("AgentAsk",20);
    agents.push_back(agent);
    agents.push_back(human);
    agents.push_back(agent2);

    for(auto agent : agents) {
        cout << agent->type() << " ";
        cout << boolalpha << (agent->type() == Agent::TYPE) << endl;
    }
    //free up memory allocated using new
    // or just use smart pointers

    return 0;
}
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