Re: [Toon-members] Re: STL containers with TooN

[Gerhard Reitmayr]

Hi,
On 11 Jan 2010, at 22:05, Gabriel Nützi wrote:

> This code works:
> 
> list<Vector<Dynamic,double> > la;
>       la.push_back(makeVector(3,1,2,3,4));
>       la.push_back(makeVector(3,1,3,4));
>       la.push_back(makeVector(4,2,1,2,3,4));
>       la.push_back(makeVector(4,3,4));
>       la.push_back(makeVector(4,2,1,2,3,4,9,2,1));
>       la.push_back(makeVector(3,1,2,3,4));
>       la.push_back(makeVector(3,1,3,4));
>       la.push_back(makeVector(4,2,1,2,3,4));
>       la.push_back(makeVector(4,3,4));
>       la.push_back(makeVector(4,2,1,2,3,4,9,2,1));
>       
>       list<Vector<Dynamic,double> >::iterator it;
>       
>       for(it = la.begin();it!=la.end();it++){
>               cout << *it <<endl;
>       }
>       
>       advance(it,8);
>       it = la.erase(la.begin(),it);
>       cout <<"erase"<<endl;
>       for(it = la.begin();it!=la.end();it++){
>               cout << *it <<endl;
>       }
> 
> but the code from Gerhard, gives the fallowing error (resizable works):
> /Users/gabrielnutzi/Desktop/TooNTest/TooN/internal/vbase.hh:96: error: no 
> matching function for call to 
> 'TooN::Internal::VectorAlloc<-0x00000000000000001, double>::VectorAlloc()'
> /Users/gabrielnutzi/Desktop/TooNTest/TooN/internal/allocator.hh:167: note: 
> candidates are: TooN::Internal::VectorAlloc<-0x00000000000000001, 
> Precision>::VectorAlloc(int) [with Precision = double]
> /Users/gabrielnutzi/Desktop/TooNTest/TooN/internal/allocator.hh:160: note:    
>              TooN::Internal::VectorAlloc<-0x00000000000000001, 
> Precision>::VectorAlloc(const 
> TooN::Internal::VectorAlloc<-0x00000000000000001, Precision>&) [with 
> Precision = double]
> 
> What is the difference in allocation when it comes to a resizable ?
> 

most likely list.push_back uses a copy constructor (creates a new list element 
that has as a member a Vector<Dynamic>) then the size is set at construction 
time and everything works. 

push_back should not work for a vector as typically elements are already 
allocated and constructed and only assigned...

actually my code seems to fail, as there is no default constructor for 
Vector<Dynamic>, is that right ?

but another list implementation might work differently...

cheers,
  Gerhard

> Thanks!
> 
> 
> 
> 
> Am 11.01.2010 um 18:09 schrieb Gerhard Reitmayr:
> 
>> vector<Vector<Dynamic> > v(10); // 10 dynamic vectors
>> v[0] = Vector<Dynamic>(10);     // set first to a vector with 10 els
>> v[1] = Vector<Dynamic>(20);     // set second to a vector with 20 els
> 

--
Gerhard Reitmayr
Institute for Computer Graphics and Vision
http://www.icg.tugraz.at/Members/gerhard
tel: ++43 316 873 5082