Dag Lindbo wrote:
> Ola Skavhaug wrote:
>> Dag Lindbo skrev den 09/04-2008 følgende:
>>> Hello again!
>>>
>>> Why is it not possible any longer to get the Vector associated with a
>>> Function? E.g:
>>>
>>> #include <dolfin.h>
>>> using namespace dolfin;
>>>
>>> int main()
>>> {
>>> Function u;
>>> Vector& v = u.vector();
>>> }
>>
>> int main()
>> {
>> Function u;
>> Vector v;
>> v = u.vector();
>> return 0;
>> }
>>
>> Should work. A Function returns a GenericVector reference, and the Vector
>> reference needs to be a Vector. Then the operator= in Vector is
>> applied in the
>> assignment.
>>
>> Ola
>
> Ola,
>
> Sorry if I'm this is a stupid/incorrect observation. What you propose is
> a a deep copy of the vector. So something like
>
> uBlasVector& vv = *(v.instance());
> vv[0] = 1000.32;
>
> has no impact on the data owned by u. uBlas only has deep copy
> semantics, which are invoked in dolfin::Vector::operator= (i.e. *vector
> = *x; )
>
> Is this really what we want?
>
> /Dag
>
Seems I'm also sloppy with grammar today. My previous post may sound
offensive towards Ola, but I only meant to pre-excuse _myself_ in case
my understanding of C++ has deserted me this evening. /Dag
>>
>>> error: invalid initialization of reference of type ‘dolfin::Vector&’
>>> from expression of type ‘dolfin::GenericVector’
>>>
>>> na55:cpp > scons
>>> c++ -o test.o -c -Wall -pipe -ansi -g -Werror -O2 -pthread -DDEBUG
>>> -DNDEBUG -DPACKAGE_VERSION="0.7.2" -DHAS_UMFPACK=1 -DHAS_GTS=1
>>> -I/usr/local/include
>>> -I/usr/lib/python2.5/site-packages/numpy/core/include
>>> -I/usr/include/suitesparse -I/usr/include/python2.5
>>> -I/usr/include/libxml2 -I/usr/include/glib-2.0
>>> -I/usr/lib/glib-2.0/include test.cpp
>>> test.cpp: In function ‘int main()’:
>>> test.cpp:8: error: invalid initialization of reference of type
>>> ‘dolfin::Vector&’ from expression of type ‘dolfin::GenericVector’
>>> cc1plus: warnings being treated as errors
>>> test.cpp:8: warning: unused variable ‘v’
>>> scons: *** [test.o] Error 1
>>>
>>> I hope this functionality hasn't been removed.
>>>
>>> /Dag
>>> _______________________________________________
>>> DOLFIN-dev mailing list
>>> [email protected]
>>> http://www.fenics.org/mailman/listinfo/dolfin-dev
_______________________________________________
DOLFIN-dev mailing list
[email protected]
http://www.fenics.org/mailman/listinfo/dolfin-dev
