To Access other class instance in static function

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Hi Everyone..

Am quite confused about static function. Here a little part program.

//Header.h

C++

class A
{
public:
        COtherClass m_var;  // Here COtherClass is different class & am creating instance variable called m_var.

protected:
        static void Display();
};

Anyhow i can access m_var in Display() function, by making Display() as non static function.
My question is: Can i access m_var in Display(static function) ??

//Header.cpp

C++

void A :: Display()
{
  m_var.GetDocument();  //GetDocument() is the method in COtherClass.
}

Posted 28-Aug-12 23:48pm

Guru_C++

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Pablo Aliskevicius · Accepted Answer · 2012-08-29T00:57:00

No.

A non-static function receives the hidden 'this' pointer. When you write m_var.GetDocument();, the compiler reads this->m_var.GetDocument();.

A static function does not receive the 'this' pointer. So, when you try to use an instance (non-static) method, the compiler asks "Which instance?".

You can either make m_var a static member, or keep GetDocument() as an instance method.

Hope this helps,

Pablo.