How to initialize derived class from static method's return object?

Question

How can I initialize class' base class by return value in construct? Let's say I have this as a base class:

class Base
{
    public function Foo()
    {
    }

    private $_var;
}

I also have this one static method from another class, which returns Base class:

class MyStaticClass
{
    public static function Get()
    {
        return new Base();
    }
}

and now I derive from base class it here:

class Derived extends Base
{
    public function __construct()
    {
        // Here, how can I initialize Base class with
        // object MyStaticClass returns? Something like

        parent = MyStaticClass::Get(); // This doesn't obviously work..
    }
}

Is there any solution / workaround to this?

If you have the need to do this... it seems that you need to re-think your architectural design. Why would you want to change the parent of a class during it's construction after it's after been declared as extending another class ? Can you give some contextual example ? — ehanoc
– ehanoc, Commented May 10, 2012 at 8:51

fivedigit · Accepted Answer · 2012-05-10 07:30:47Z

0

Though it seems like an uncommon way of doing it, you probably mean this:

class Derived extends Base
{
    public function __construct()
    {
        parent::__construct(MyStaticClass::Get());
    }
}

answered May 10, 2012 at 7:30

fivedigit

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3 Comments

nhaa123 Over a year ago

But the Base-class does not have constructor. Does this still work?

yuvin Over a year ago

Probably you should define Base's copy constructor accepting Base type as a parameter

fivedigit Over a year ago

Every class has a constructor. If Base only has the default constructor (which I assumed not), then this will not work, since the default constructor doesn't accept any arguments. Base's constructor needs a parameter of type Base then.

Community · Accepted Answer · 2017-05-23 12:20:17Z

0

I have not found a way to directly do that, but if you are willing to let go of class, you can accomplish this with javascript-style OOP. See my answer on https://stackoverflow.com/a/10468793/1369091

edited May 23, 2017 at 12:20

CommunityBot

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answered May 10, 2012 at 8:44

Removed

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