Dereferencing pointers

[nifsmith]

Is

*(pointer1->pointer2)

The same as

(*(*pointer1).p ointer2)

TYIA

nifsmith

[John Harrison]

Re: Dereferencing pointers


"nifsmith" <hawklord451@ly cos.co.uk> wrote in message
news:cl2lif$5lc $1@sparta.btint ernet.com...[color=blue]
> Is
>
> *(pointer1->pointer2)
>
> The same as
>
> (*(*pointer1).p ointer2)
>
> TYIA
>
> nifsmith[/color]

Yes.

john

[Sharad Kala]

Re: Dereferencing pointers


"nifsmith" <hawklord451@ly cos.co.uk> wrote in message[color=blue]
> Is
>
> *(pointer1->pointer2)
>
> The same as
>
> (*(*pointer1).p ointer2)
>[/color]

Yes.
Section 5.2.5 paragraph 3 - "If E1 has the type ``pointer to class X,'' then
the expression E1->E2 is converted to the equivalent form (*(E1)).E2;"

Sharad

[JKop]

Re: Dereferencing pointers

nifsmith posted:
[color=blue]
> Is
>
> *(pointer1->pointer2)
>
> The same as
>
> (*(*pointer1).p ointer2)
>
> TYIA
>
> nifsmith[/color]


Yes, it is for *pointers*.


Note however, that for acutal objects, it doesn't always hold true.


For instance:


struct Monkey
{
int* tail;
};


class Blah
{
public:

Monkey a;

Monkey b;

Monkey& operator*()
{
return a;
}

Monkey& operator->()
{
return b;
}
};


int main()
{
Blah poo;

int k;

*( poo->tai l) = &k;

*( (*poo).tail ) = &k;
}


In that above, the statements do two totally different things, ie. there's
two different "tail"s!

(Actually now as I'm writing this, I'm not 100% sure that you can overload
->)


-JKop

[Catalin Pitis]

Re: Dereferencing pointers


"JKop" <NULL@NULL.NULL > wrote in message
news:X35dd.3946 9$Z14.13988@new s.indigo.ie...
[...][color=blue]
> (Actually now as I'm writing this, I'm not 100% sure that you can overload
> ->)[/color]

Yes you can

Catalin

[JKop]

Re: Dereferencing pointers

Catalin Pitis posted:
[color=blue]
>
> "JKop" <NULL@NULL.NULL > wrote in message
> news:X35dd.3946 9$Z14.13988@new s.indigo.ie...
> [...][color=green]
>> (Actually now as I'm writing this, I'm not 100% sure that you can
>> overload ->)[/color]
>
> Yes you can
>
> Catalin[/color]



This pleases me!

( C++, 1 point, Bullshit, 0 points )


-JKop