RE: [Dev-C++] STL, iterators and pointers?

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Phil Schulz
> Sent: Saturday, July 07, 2001 10:21 AM
> To: dev...@li...
> Subject: Re: [Dev-C++] STL, iterators and pointers?
> 
> okay, that's pretty clear.  I had been looking at examples 
> that start with defining an empty container and then adding 
> to it using pushback() or insert(), so it wasn't clear to 
> me...  I forgot that I probably have to define copy 
> constructors for my classes. Haven't tested this yet, but 
> this might be the problem...  

When you use pushback() and vector is full, new objects within the
vector are created.


> nope, definitely defined as objects.
> My problem is when I try to assign  &(*iter) to a pointer, I 
> get compile errors 
> "initialization to `Book *' from `const Book *' discards 
> qualifiers" I'll make the new pointer a const, but that'll 
> require another function to be declared a CONST and on and on 
> , to a point of uselessness. 


Code that works:

A)
#include <vector>

class A
{
};

int main()
{
vector<A> test(10);
A *p;
p=&test[0];
}


B)

#include <vector>

class A
{
};

int main()
{
vector<A> test(10);
vector<A>::iterator iter=test.begin();
A *p;
p=&(*iter);
}



Code that does not work (of course):

#include <vector>

class A
{
};

int main()
{
vector<A> test(10);
vector<A>::const_iterator iter=test.begin();
A *p;
p=&(*iter);
}



You probably were using const_iterator or doing something else wrong.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys