dzaak@fm.bs.dlr.de (Frank Dzaak) writes:


>I would like to know whether a template argument has to be supplied
>for an argument typ in a member function or not. Which of the two
>version is correct?

>         #include <iostream.h>
>         #include <stdio.h>
>
>         template<class T>
>         class A {
>           T e;
>           A<T> *a;
>         public:
>           A(const T& i) { e=i; a=NULL; }
>either
>           A(const T& i, A& r) { e=i; a=&r; }
>or
>           A(const T& i, A<T>& r) { e=i; a=&r; }

They mean the same. Both should be accepted by the compiler. However, ...

>         };
>
>         int main()
>         {
>           int i=2;
>           A<float> a(i);
>           A<int> b(i, a);
>         }

Your example is flaw. 'a' has type A<float>. The arg 'r' in the two-arg
constructor has the same type as the specialised class which in the
example is A<int>.

--Francis


[ comp.std.c++ is moderated.  To submit articles: try just posting with      ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu         ]
[ FAQ:      http://reality.sgi.com/employees/austern_mti/std-c++/faq.html    ]
[ Policy:   http://reality.sgi.com/employees/austern_mti/std-c++/policy.html ]
[ Comments? mailto:std-c++-request@ncar.ucar.edu                             ]

>>>>> In article <DyA6x7.JoJ@news.dlr.de>,   dzaak@fm.bs.dlr.de (Frank
>>>>> Dzaak) writes:

> Dear C++ Experts,
> I would like to know whether a template argument has to be supplied
> for an argument typ in a member function or not. Which of the two
> version is correct?

>          template<class T>
>          class A {
>          public:
> either
>            A(const T& i, A& r) { e=i; a=&r; }
> or
>            A(const T& i, A<T>& r) { e=i; a=&r; }

>          };

Both.  If A<T> is equivalent to A inside A<T> definition.

--
Alexandre Oliva
mailto:oliva@dcc.unicamp.br
Universidade Estadual de Campinas, SP, Brasil
---
[ comp.std.c++ is moderated.  To submit articles: Try just posting with your
                newsreader.  If that fails, use mailto:std-c++@ncar.ucar.edu
  comp.std.c++ FAQ: http://reality.sgi.com/austern/std-c++/faq.html
  Moderation policy: http://reality.sgi.com/austern/std-c++/policy.html
  Comments? mailto:std-c++-request@ncar.ucar.edu
]

Dear C++ Experts,

I would like to know whether a template argument has to be supplied
for an argument typ in a member function or not. Which of the two
version is correct?

         #include <iostream.h>
         #include <stdio.h>

         template<class T>
         class A {
           T e;
           A<T> *a;
         public:
           A(const T& i) { e=i; a=NULL; }
either
           A(const T& i, A& r) { e=i; a=&r; }
or
           A(const T& i, A<T>& r) { e=i; a=&r; }

         };

         int main()
         {
           int i=2;
           A<float> a(i);
           A<int> b(i, a);
         }

Mit freundlichen Gruessen   Frank Dzaak.

_______________________________________________________________________________

Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V.
Institut fuer Flugmechanik
Frank Dzaak
Postfach 32 67     Tel: +49 531 295 2706
38022 Braunschweig    Fax: +49 531 295 2877
Deutschland          Email: dzaak@fm.bs.dlr.de
_______________________________________________________________________________
---
[ comp.std.c++ is moderated.  To submit articles: Try just posting with your
                newsreader.  If that fails, use mailto:std-c++@ncar.ucar.edu
  comp.std.c++ FAQ: http://reality.sgi.com/austern/std-c++/faq.html
  Moderation policy: http://reality.sgi.com/austern/std-c++/policy.html
  Comments? mailto:std-c++-request@ncar.ucar.edu
]