Problem encountered in writing a class which extends QList

[Jens Zurheide]

Saturday 02 March 2002 05:36 Dung Patrick
>I need a new Class which extends QList. I have the following code but get
> error:
QList is a template class. If you do not know what this is a good book 
about C++ might help because this is an advanced feature of the programming 
language C++ and can not be explained in a short posting. A very tearse 
explanation is: this list can become a list holding any type you want.
>
>rule.h:
>#ifndef RULE_H
>#define RULE_H
>#include <qlist.h>
>
If you want Rule to be as generic as QList you should write something like 
this:
template< typename T >
  class Rule : public QList<T> {
  public :
    Rule();
    virtual ~Rule();
  };
>class Rule : public QList {
>public:
>Rule();
>~Rule();
>};
>#endif
>
>rule.cpp:
>#include "rule.h"
template< typename T>
  Rule<T>::Rule()
  {
  }
template< typename T>
  Rule<T>::~Rule()
  {
  }
>Rule::Rule(){
>}
>Rule::~Rule(){
>}
>
and somewhere else

Rule<type_of_what_you_want> r;


However if you don't want to be Rule as generic as QList but a list to a 
specific data type you might want to declare your class like:

class Rule : public QList<whatever_type_you_want> {
public:
  Rule();
  ~Rule();
};

Rule::Rule(){
}
Rule::~Rule(){
}


Hope this helps.

Jens

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