Re: Problem with Compilerupdate 3.3.5 -> 4.0.2

Re: Problem with Compilerupdate 3.3.5 -> 4.0.2

[Oliver Kullmann]

On Wed, Feb 01, 2006 at 06:08:23PM +0100, Christian Weckmueller wrote:
> Hello dear gcc-helper,
>
> I have a program without problems compiling with 3.3.5 but don't work with
> 4.0.2. So here is the question: are there big differences in templates
> combined with inheritance between these versions?
>
> I give you a part of the code:
>
> template<typename T> class Vector{
>
>     protected:
>               T       *vectorPtr;
>               size_type dim;                                          <<<<<
>               unsigned short coutwidth;
> ...
> };
>
> template<typename T> class NumericVector : public Vector<T>{
>
>     public:
>               NumericVector() : Vector<T>(){}
>               NumericVector(size_type dim) : Vector<T>(dim){}
>               NumericVector(size_type dim, T initVal) : Vector<T>(dim, 
initVal){}
>               NumericVector( const Vector<T> &src );
>
>               void makeHilb();
> };
>
> template<typename T> NumericVector<T>::NumericVector( const Vector<T> &src )
{
>
>       dim             = src.length();                                             
<<<<<<<
>       vectorPtr       = NULL;
>       unsigned short counter  = 3;
> ...
> }
>
> in the program i use NumericVector. the compiler 4.0.2 says he don't know
> dim
> in the convertconstructor of NumericVector
>
> the older one is fine with this program.
>
> Can anybody explain why there is a problem?
>
> Thanks, cris

Hi,

g++ 4.0.2 is right, your code is incorrect:

since class template NumericVector uses a *dependant* base class Vector<T>,
members of this base class must be qualified. So to get access to dim
in that constructor, you need to call it

Vector<T>::dim

or

this -> dim.

(A using declaration

using Vector<T>::dim;

also does the job.)

Oliver

P.S. Search for "dependant names" in the index of

@Book{JV2002,
  author =         {David Vandevoorde and Nicolai M. Josuttis},
  title =          {C++ Templates: The Complete Guide},
  publisher =          {Addison-Wesley},
  year =          2002,
  address =         {Boston},
  month =         {November},
  note =         {ISBN 0-201-73484-2; QA76.73.C153 V37 2003},
  annote =         {Vorhanden.}
}

Problem with Compilerupdate 3.3.5 -> 4.0.2

[Christian Weckmueller]

Hello dear gcc-helper,

I have a program without problems compiling with 3.3.5 but don't work with 
4.0.2. So here is the question: are there big differences in templates 
combined with inheritance between these versions?

I give you a part of the code:

template<typename T> class Vector{

    protected:
		T	*vectorPtr;
		size_type dim;						<<<<<
		unsigned short coutwidth;
...
};

template<typename T> class NumericVector : public Vector<T>{

    public:
		NumericVector() : Vector<T>(){}
		NumericVector(size_type dim) : Vector<T>(dim){}
		NumericVector(size_type dim, T initVal) : Vector<T>(dim, initVal){}
		NumericVector( const Vector<T> &src );
		
		void makeHilb();
};

template<typename T> NumericVector<T>::NumericVector( const Vector<T> &src ){

	dim 		= src.length();                                             <<<<<<<
	vectorPtr 	= NULL;
	unsigned short counter 	= 3;
...
}

in the program i use NumericVector. the compiler 4.0.2 says he don't know       
dim
in the convertconstructor of NumericVector

the older one is fine with this program.

Can anybody explain why there is a problem?

Thanks, cris