STL vector with iterators

[Jan.Steinke]

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

 

[=?ISO-8859-1?Q?Stefan_N=E4we?=]

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?

Where's the code ?

S.

 

[Gianni Mariani]

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?

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_iterator > myVector

 

[Stephane Wirtel]

(e-mail address removed) said the following on 20/01/2006 12:51:

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

Can you try this template class ?

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

 

[Axter]

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

I recommend not using raw pointers in your container, and instead use
smart pointers like boost::shared_ptr 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]

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_iterator > myVector

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