Calling static function using uninitialized pointer??

[qazmlp1209@rediffmail.com]

Is the following code reliable? I'm wondering whether it is valid to
invoke the static function using uninitialized pointer.

-----------------
#include <iostream>

class staticCl
{
public:
static void display()
{
}

} ;

int main()
{
staticCl* ptr ;
ptr->display() ;

}
-----------------

[Ian Collins]

Re: Calling static function using uninitialized pointer??

qazmlp1209@redi ffmail.com wrote:[color=blue]
> Is the following code reliable? I'm wondering whether it is valid to
> invoke the static function using uninitialized pointer.
>[/color]
A static member isn't called using the pointer. What you have is
undefined behaviour.


--
Ian Collins.

[Markus Moll]

Re: Calling static function using uninitialized pointer??

Hi

qazmlp1209@redi ffmail.com wrote:
[color=blue]
> Is the following code reliable? I'm wondering whether it is valid to
> invoke the static function using uninitialized pointer.[/color]
[color=blue]
> staticCl* ptr ;
> ptr->display() ;[/color]

The expression is equivalent to "(*ptr).display ()", so you invoke undefined
behavior by dereferencing ptr.

Markus

[Henryk]

Re: Calling static function using uninitialized pointer??

> A static member isn't called using the pointer. What you have is[color=blue]
> undefined behaviour.[/color]

Right. The code may work with most compilers but you can not rely on
that.

Just to clarify: Call your method staticCl::displ ay() ...

--
Henryk

[Jaspreet]

Re: Calling static function using uninitialized pointer??

qazmlp1209@redi ffmail.com wrote:[color=blue]
> Is the following code reliable? I'm wondering whether it is valid to
> invoke the static function using uninitialized pointer.
>
> -----------------
> #include <iostream>
>
> class staticCl
> {
> public:
> static void display()
> {
> }
>
> } ;
>
> int main()
> {
> staticCl* ptr ;
> ptr->display() ;
>
> }
> -----------------[/color]

Undefined behaviour. Why not use staticCl::displ ay() ?