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Message-ID: <1101310514.41a4aa3296c36@webmail.fib.upc.es>
Date: Wed, 24 Nov 2004 16:30:00 -0000
From: e7677215@est.fib.upc.edu
To: Giovanni Bajo <giovannibajo@libero.it>
Cc: gcc@gcc.gnu.org
Subject: Re: nurbs cannot be compiled with gcc 3.4
References: <1101288663.41a454d70a0dc@webmail.fib.upc.es> <25ad01c4d210$782e33a0$2fb82997@bagio>
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> e7677215@est.fib.upc.edu wrote:
>
> > I need to install nurbs++-3.0.11 compiling it with gcc 3.4...., it
> > can be compiled with gcc 3.3 but it cannot be compiled with gcc 3.4,
> > it returns a lot of errors. I soved some problems of templates, but
> > there's one I can't solve :
> >
> > nurbs.cpp: In member function `BasicList<PLib::Point_nD<T, D> >
> > PLib::NurbsCurve<T, N>::tesselate(T, BasicList<T>*) const [with T =
> > float, int N = 3]':
> > f_nurbs.cpp:56:   instantiated from here
> > nurbs.cpp:5252: error: no matching function for call to
> > `BasicList<PLib::Point_nD<float, 3>
> >>>> BasicList(BasicList<PLib::Point_nD<float, 3> >)'
> > ../matrix/list.h:128: note: candidates are:
> > BasicList<T>::BasicList(BasicList<T>&) [with T =
> > PLib::Point_nD<float, 3>] nurbs.cpp: In member function
> > `BasicList<PLib::Point_nD<T, D> > PLib::NurbsCurve<T,
> > N>::tesselate(T, BasicList<T>*) const [with T = float, int N = 2]':
>
>
> Looks like you are attemping to bind a temporary to a non-const reference.
> This
> is invalid. More to the point, a copy constructor should always be declared
> as
> A(A const &), not A(A&). BasicList<T>'s copy constructor seems to violate
> this.
>
> BTW, when upgrading to 3.4, http://gcc.gnu.org/gcc-3.4/changes.html can be
> very
> helpful.
>
> Giovanni Bajo
>
>

Well, I don't know what I'm doing wrong but I can't compile it. Here are the
functions :




from nurbs.cpp :

template <class T, int N>
BasicList< Point_nD<T,N> > NurbsCurve<T,N>::tesselate(T tolerance,BasicList<T>
*uk) const{
  BasicList< Point_nD<T,N> > list, list2 ;

  NurbsCurveArray<T,N> ca ;
  decompose(ca) ;

  if(ca.n()==1){
    // get the number of steps
    T u = 0 ;
    Point_nD<T,N> maxD(0) ;
    Point_nD<T,N> prev ;

    Vector< Point_nD<T,N> > ders(2) ;

    deriveAt(u,1,ders) ;

    prev = ders[1] ;

    int i ;
    for(i=1;i<11;++i){
      u = T(i)/T(10) ;
      deriveAt(u,1,ders) ;
      Point_nD<T,N> delta = ders[1]-prev ;
      delta.x() = absolute(delta.x()) ;
      delta.y() = absolute(delta.y()) ;
      delta.z() = absolute(delta.z()) ;
      maxD = maximumRef(maxD,delta) ;
      prev = ders[1] ;
    }

    const T sqr2 = T(1.414241527) ;

    int n = (int)rint(sqr2*norm(maxD)/tolerance) ;

    n+=2 ;
    if(n<3) n = 3 ;

    for(i=0;i<n;++i){
      u = (U[U.n()-deg_-1]-U[deg_])*T(i)/T(n-1) + U[deg_] ;
      list.add(pointAt(u)) ;
      if(uk)
	uk->add(u) ;
    }

    return list ;
  }
  else{
    for(int i=0;i<ca.n();++i){
      list2 = ca[i].tesselate(tolerance,uk) ; <------------ line 5252

      // remove the last point from the list to elliminate
      list.erase((BasicNode<Point_nD<T,N> >*)list.last()) ;
      list.addElements(list2) ;
    }
  }
  return list ;
}





from list.h :

template <class T>
BasicList<T>::BasicList(BasicList<T> const &a): BasicNode<T>() { <---- line 128
  first_ = last_ = 0 ;
  current = first_ ;
  *this = a ;
  nc = 0 ;
  n = 0 ;
}




What's wrong?

Thanks.