sort / vector

[eiji]

Hi folks,
I have a problem compiling this under VC6!
Maybe someone has some minutes to look at this:

template<class T> class Compare
{
public:
Compare(){};
virtual ~Compare(){};

bool operator()(cons t T& T1, const T& T2) const
{return T1.GetNumber() < T2.GetNumber(); }
};

class Element
{
public:
Element(Model* model, unsigned int number);
virtual ~Element();

unsigned int GetNumber() const { return _number;}
}

std::vector<Ele ment*>* elements = new std::vector<Ele ment*>(0);

elements->push_back(ne w Element()); // n-times
std::vector<Ele ment*>::const_i terator iterFirst = elements->begin() ;
std::vector<Ele ment*>::const_i terator iterLast = elements->end() ;

std::sort(iterF irst, iterLast, Compare<Element >());

My Compiler tells me(sorry my compiler speaks german, but it is
readable):
error C2664: '()' : Konvertierung des Parameters 1 von 'class
fesolv::Element *' in 'const class fesolv::Element &' nicht moeglich
Ursache: Konvertierung von 'class fesolv::Element *' in 'const
class fesolv::Element ' nicht moeglich

I don't know where to start.
Do sort also works for vector<T*>* or only for vector<T*> ????

Thanks,
eiji

[Bob Hairgrove]

On 27 Nov 2005 13:22:30 -0800, "eiji" <Sa*****@gmx.de > wrote:

Thanks a lot.

bool operator()(cons t T* T1, const T* T2) const
{return T1->GetNumber() < T2->GetNumber(); }
and
std::vector<El ement*>::iterat or iterFirst = elements->begin() ;
std::vector<El ement*>::iterat or iterLast = elements->end() ;
(no const iterators)
and
Compare<Elemen t> cmp_obj;

works fine!

I didn't put in all code, because the classes are quit big!

(2) You should never use names beginning with an underscore for
anything (see section 17.4.3.1.2 of the C++ for the reason).

Nice to know!

Duh ... I just realized why you cannot use a const_iterator:
std::sort() needs to reassign the vector elements in order to sort
them!

(Guess I shouldn't post so late at night!)

--
Bob Hairgrove
No**********@Ho me.com