Problem with pointers and iterators

[Griff Johns]

Hi, if I have the following code:
class MyObject
{
public:
MyObject() {};
~MyObject() {};

int x;

}

class MyObjectList : public std::vector<MyO bject{};

void Foo(MyObject* obj)
{
// Do something with obj->x

}

If I loop through it like this:

MyObjectList list;
// stuff list with objects

MyObjectList::i terator it;
for (it = list.begin(); it != list.end(); ++it) {
// I used to be able to do this:
MyObject* p_obj = it;
Foo(p_obj);

// Or this
Foo(it);

}

But now the error I get is 'cannot convert parameter 1 from
'std::vector<_T y>::iterator' to 'MyObject *'

This is after migrating a project from vc6.0 to vc7.1, but I think that
the issue lies with the language standards(?). So why does this happen
now, and how do I resolve it?

Thanks.

[Richard Tobin]

Re: Problem with pointers and iterators

In article <20081006170143 16807-pete@versatilec odingcom>,
Pete Becker <pete@versatile coding.comwrote :
[deleted]

For those baffled by this slew of messages, the original seems to have
been posted to comp.lang.c++ with followups set to comp.lang.c.
I'm posting this to both with followups set to comp.lang.c++ so
that it can be taken up over there.

-- Richard
--
Please remember to mention me / in tapes you leave behind.

[Default User]

Re: Problem with pointers and iterators

Griff Johns wrote:

Why in the hell did you set follow-ups to comp.lang.c?





Brian

[Griff Johns]

Re: Problem with pointers and iterators

What do you mean? I'm posting this to comp.lang.c++ but the only two
replies have gone on about comp.lang.c for some reason.

This is a C++ question and I think this is the right place to post it?

On Mon, 06 Oct 2008 21:59:45 +0000, Default User wrote:

Griff Johns wrote:
>
Why in the hell did you set follow-ups to comp.lang.c?
>
>
>
>
>
Brian

[red floyd]

Re: Problem with pointers and iterators

On Oct 6, 1:56 pm, Griff Johns <n...@spam.comw rote:

Hi, if I have the following code:
class MyObject
{
public:
   MyObject() {};
   ~MyObject() {};

Delete the semicolons after constructor/destructor.

>
   int x;
>
}
>
class MyObjectList : public std::vector<MyO bject{};
>
void Foo(MyObject* obj)
{
   // Do something with obj->x
>
}
>
If I loop through it like this:
>
MyObjectList list;
// stuff list with objects
>
MyObjectList::i terator it;
for (it = list.begin(); it != list.end(); ++it) {
   // I used to be able to do this:
   MyObject* p_obj = it;
   Foo(p_obj);
>
   // Or this
   Foo(it);
>
}
>
But now the error I get is 'cannot convert parameter 1 from
'std::vector<_T y>::iterator' to 'MyObject *'
>
This is after migrating a project from vc6.0 to vc7.1, but I think that
the issue lies with the language standards(?).  So why does this happen
now, and how do I resolve it?

use Foo(&*it);