STL vector with iterators

[Jan.Steinke@t-online.de]

Hi there,
i've got a STL list like this:
list<object *> myList;
Now, i want to create a vector with iterators of this list like this:

vector< list<object *>::iterator > myVector

Where's the fault?

thanks for reply,
Jan

[Gianni Mariani]

Re: STL vector with iterators

Jan.Steinke@t-online.de wrote:[color=blue]
> Hi there,
> i've got a STL list like this:
> list<object *> myList;
> Now, i want to create a vector with iterators of this list like this:
>
> vector< list<object *>::iterator > myVector
>
> Where's the fault?[/color]

That's ok. If you're using it in a template, it won't work. You'll
need this:

vector< typename list<object *>::iterator > myVector

You may also need to worry about const-ness.

vector< typename list<object *>::const_itera tor > myVector

[Stefan Näwe]

Re: STL vector with iterators

Jan.Steinke@t-online.de schrieb:[color=blue]
> Hi there,
> i've got a STL list like this:
> list<object *> myList;
> Now, i want to create a vector with iterators of this list like this:
>
> vector< list<object *>::iterator > myVector
>
> Where's the fault?[/color]

Where's the code ?

S.
--
Stefan Naewe
naewe.s_AT_atla s_DOT_de

[Stephane Wirtel]

Re: STL vector with iterators

Jan.Steinke@t-online.de said the following on 20/01/2006 12:51:[color=blue]
> Hi there,
> i've got a STL list like this:
> list<object *> myList;
> Now, i want to create a vector with iterators of this list like this:
>
> vector< list<object *>::iterator > myVector[/color]

Can you try this template class ?

template< typename T > class MyVector
: public std::vector< typename std::list <T *> :: iterator > {
};


[color=blue]
>
> Where's the fault?
>
> thanks for reply,
> Jan
>[/color]

[Axter]

Re: STL vector with iterators

Jan.Steinke@t-online.de wrote:[color=blue]
> Hi there,
> i've got a STL list like this:
> list<object *> myList;
> Now, i want to create a vector with iterators of this list like this:
>
> vector< list<object *>::iterator > myVector
>
> Where's the fault?
>
> thanks for reply,
> Jan[/color]

I recommend not using raw pointers in your container, and instead use
smart pointers like boost::shared_p tr or smart_ptr

http://code.axter.com/smart_ptr.h

Other pointers:

http://code.axter.com/cow_ptr.h

http://code.axter.com/copy_ptr.h

Are you sure you need the list container in the first place. It's
rarely optimal to use std::list over std::vector/std::deque.
If you're not doing a lot of insertions and deletions in the center of
the container, you should consider just using std::vector in the first
place.
I recommend you do some performance test to see if you really need the
std::list in the first place.

[roberts.noah@gmail.com]

Re: STL vector with iterators


Gianni Mariani wrote:[color=blue]
> Jan.Steinke@t-online.de wrote:[color=green]
> > Hi there,
> > i've got a STL list like this:
> > list<object *> myList;
> > Now, i want to create a vector with iterators of this list like this:
> >
> > vector< list<object *>::iterator > myVector
> >
> > Where's the fault?[/color]
>
> That's ok. If you're using it in a template, it won't work. You'll
> need this:
>
> vector< typename list<object *>::iterator > myVector
>
> You may also need to worry about const-ness.
>
> vector< typename list<object *>::const_itera tor > myVector[/color]

When and why you need 'typename' is explained pretty well in Thinking
in C++ V2, which is available for download on the internet.