dev-cpp-users

[Dev-C++] STL list problem

[<qa...@ho...>]

Hello all,

I get an errormessage when I compile and I can't figure out what the=
 problem is.
Here's the code

#include <iostream>
#include <list>

int main(int argc, char *argv[]){
  list<int> initialWeightList;
  for(int i=3D0; i<10; i++)
    initialWeightList.push_back(i);               
 
 list<int>::iterator iter;
 for(
   iter =3D initialWeightList.begin(); 
   iter < initialWeightList.end(); // <--- error ?!?!?!
    iter++
    ){
    cout << "Here i do something" << endl;
    }    
}

and here's the errormessage

12 D:\Programmering\IDE\Dev-Cpp\__Projects\Test\main.cpp
no match for `_List_iterator<int,int &,int *> & < _List_iterator<int,int=
 &,int *>'

The for-statement is split up so I can locate the error

Any ideas?
If I replace all list<int> by vector<int>, and include <vector> ofcourse,=
 it works just fine.

Regards
/J=F6rgen

Re: [Dev-C++] STL list problem

[<h.r...@gm...>]

> Hello all,
> 
> I get an errormessage when I compile and I can't figure out what the
>  problem is.
> Here's the code
> 
> #include <iostream>
> #include <list>
> 
> int main(int argc, char *argv[]){
>   list<int> initialWeightList;
>   for(int i=0; i<10; i++)
>     initialWeightList.push_back(i);               
>  
>  list<int>::iterator iter;
>  for(
>    iter = initialWeightList.begin(); 
>    iter < initialWeightList.end(); // <--- error ?!?!?!
>     iter++
>     ){
>     cout << "Here i do something" << endl;
>     }    
> }
> 
> and here's the errormessage
> 
> 12 D:\Programmering\IDE\Dev-Cpp\__Projects\Test\main.cpp
> no match for `_List_iterator<int,int &,int *> & < _List_iterator<int,int
>  &,int *>'
> 
> The for-statement is split up so I can locate the error
> 
> Any ideas?
> If I replace all list<int> by vector<int>, and include <vector> ofcourse,
>  it works just fine.
> 
> Regards
> /Jörgen
> 
> 
Hi,
This works (with mingw2.0.0-3):

#include <iostream>
#include <list>

using namespace std;

int main(int argc, char *argv[]){
  list<int> initialWeightList;
  for(int i=0; i<10; i++)
    initialWeightList.push_back(i);               
 
 list<int>::iterator iter;
 for(
   iter = initialWeightList.begin();
   iter != initialWeightList.end(); // <--- error ?!?!?!
    iter++
    ){
    cout << "Here i do something" << endl;
    }
    
    system("PAUSE");    
}

I think it is wrong to compare two iterators with < because in a list the
items are anywhere in the memory and not in order (as in vector). Iterators are
like pointers. You can compare it with == or !=.

regards
Horst

-- 
+++ GMX - Mail, Messaging & more  http://www.gmx.net +++
NEU: Mit GMX ins Internet. Rund um die Uhr für 1 ct/ Min. surfen!

Re: [Dev-C++] STL list problem

[<qa...@ho...>]

Danke Horst.
Ich habe es nichts jetzt versuchts, aber sagen sie es fungiert, es fungiert=
 :-)

That was my poor German, haven't spoken or read it since my early=
 schooldays, like 15-20 years ago.
And heres what I said (I think) in english, because that's the official=
 language of the list :-)

Thanx Horst
Haven't tried it yet, but if you say it works, it works.

/J=F6rgen

*********** REPLY SEPARATOR  ***********

On 2002-10-21 at 23:26 h.r...@gm... wrote:

>> Hello all,
>> 
>> I get an errormessage when I compile and I can't figure out what the
>>  problem is.
>> Here's the code
>> 
>> #include <iostream>
>> #include <list>
>> 
>> int main(int argc, char *argv[]){
>>   list<int> initialWeightList;
>>   for(int i=3D0; i<10; i++)
>>     initialWeightList.push_back(i);               
>>  
>>  list<int>::iterator iter;
>>  for(
>>    iter =3D initialWeightList.begin(); 
>>    iter < initialWeightList.end(); // <--- error ?!?!?!
>>     iter++
>>     ){
>>     cout << "Here i do something" << endl;
>>     }    
>> }
>> 
>> and here's the errormessage
>> 
>> 12 D:\Programmering\IDE\Dev-Cpp\__Projects\Test\main.cpp
>> no match for `_List_iterator<int,int &,int *> & < _List_iterator<int,int
>>  &,int *>'
>> 
>> The for-statement is split up so I can locate the error
>> 
>> Any ideas?
>> If I replace all list<int> by vector<int>, and include <vector>=
 ofcourse,
>>  it works just fine.
>> 
>> Regards
>> /J=F6rgen
>> 
>> 
>Hi,
>This works (with mingw2.0.0-3):
>
>#include <iostream>
>#include <list>
>
>using namespace std;
>
>int main(int argc, char *argv[]){
>  list<int> initialWeightList;
>  for(int i=3D0; i<10; i++)
>    initialWeightList.push_back(i);               
> 
> list<int>::iterator iter;
> for(
>   iter =3D initialWeightList.begin();
>   iter !=3D initialWeightList.end(); // <--- error ?!?!?!
>    iter++
>    ){
>    cout << "Here i do something" << endl;
>    }
>    
>    system("PAUSE");    
>}
>
>I think it is wrong to compare two iterators with < because in a list the
>items are anywhere in the memory and not in order (as in vector).
>Iterators are
>like pointers. You can compare it with =3D=3D or !=3D.
>
>regards
>Horst
>
>-- 
>+++ GMX - Mail, Messaging & more  http://www.gmx.net +++
>NEU: Mit GMX ins Internet. Rund um die Uhr f=FCr 1 ct/ Min. surfen!
>
>
>
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RE: [Dev-C++] STL list problem

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

=20

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of J=F6rgen
Sent: Monday, October 21, 2002 7:08 PM
To: dev...@li...
Subject: [Dev-C++] STL list problem


Hello all,
=20
I get an errormessage when I compile and I can't figure out what the
problem is.
Here's the code
=20
#include <iostream>
#include <list>
=20
int main(int argc, char *argv[]){=20

using namespace std;

=20
  list<int> initialWeightList;
  for(int i=3D0; i<10; i++)
    initialWeightList.push_back(i);              =20

 list<int>::iterator iter;
 for(
   iter =3D initialWeightList.begin();=20
   iter < initialWeightList.end(); // <--- error ?!?!?!
    iter++
    ){
    cout << "Here i do something" << endl;
    }   =20
}
=20
and here's the errormessage
=20
12 D:\Programmering\IDE\Dev-Cpp\__Projects\Test\main.cpp
no match for `_List_iterator<int,int &,int *> & < _List_iterator<int,int
&,int *>'

The for-statement is split up so I can locate the error

Any ideas?
If I replace all list<int> by vector<int>, and include <vector>
ofcourse, it works just fine.

=20
Yes list doesn't support this kind of iterators. Use !=3D instead:
=20
for(
   iter =3D initialWeightList.begin();=20
   iter !=3D initialWeightList.end();
   ++iter
    )
=20
=20
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.freeurl.com
<http://www.noicys.freeurl.com/>=20
* Alternative URL: http://run.to/noicys