Re: Inherite form stl container classes

From:

Victor Bazarov <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Mon, 02 Jun 2008 15:33:23 -0400

Message-ID:

<g21hu4$ort$1@news.datemas.de>

ademirzanetti wrote:

I would like to listen your opinions about inherit from a STL class
like list. For example, do you think it is a good approach if I
inherit from list to create something like "myList" as in the example
below ?

#include "Sector.h"

using namespace boost;

typedef std::list<Setor>::iterator ListaSetorIterator;
typedef std::list<Setor>::const_iterator ListaSetorConstIterator;

class SectorList: private std::list<Sector> {
public:

        using std::list<Sector>::begin;
        using std::list<Sector>::end;

        SectorList();
        ~SectorList();

        result add( const Sector& );
        result modify( const Sector& );
        result get( Sector&, const uint32_t ) const;
        result remove( const uint32_t );
private:
        using std::list<Sector>::push_back;
};

I do not see a problem on it. I believe it is better to inherit in
this way than try to create my own list from scratch, but I also want
to listen more opinions about it.

Thanks in advance ;-)

I am not sure what it is you're expecting us to tell you. Private
inheritance is a method of implementing your class in terms of the other
class. You're essentially creating an Adapter (see Adapter pattern, Goa
book or on the web). Another way to program an Adapter in C++ is
containment.

You've followed one of the two ways commonly accepted, why wouldn't it
be a good approach?

I suppose you're not expecting us to criticise your code on its own
merits, like the degree of completeness of the interface without any
given requirements, or typos, or extraneousness of some declarations...

V
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