Member Avatar for cambalinho

i know:
- &varname is the adress of varname;
- *varname is the value of adressed variable.
but:

void *Vvariant=NULL;

friend ostream& operator <<(ostream &os,const variant2 &obj)
{
    os << obj.Vvariant; //how can i get the value of adressed variable?
    return os;
}

how can i get the value of adressed variable?

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  • Latest Post Latest Post by cambalinho
Member Avatar for deceptikon

Just dereference it: *obj.Vvariant. But since pointers to void cannot be dereferenced, you still need to cast Vvariant to something else.

Edited by deceptikon
Member Avatar for Tumlee

What exactly is Vvariant supposed to be? It's impossible to get the value of a void* (without typecasting it first), and it's dangerous to dereference a pointer that is NULL.

Member Avatar for cambalinho

without typecasting, can i get the adressed values?
seems that i can't see what it is the type

Edited by cambalinho
Member Avatar for deceptikon

without typecasting, can i get the adressed values?

Nope. You can get just the bytes of the pointed to value by casting to char*, but without knowing what they represent, it's not terribly useful.

seems that i can't see what it is the type

You knew the type when you assigned a value to that void pointer, right? Save it so that you can recall it later.

Member Avatar for cambalinho

yah.. thanks for all
(seems that when i'm logined, i don't recive the mail notifications)

Edited by cambalinho
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