Re: Help with solving seemingly mutually exclusive problems please

From:
 Zilla <zilla62@bellsouth.net>
Newsgroups:
comp.lang.c++
Date:
Fri, 19 Oct 2007 14:50:30 -0700
Message-ID:
<1192830630.031146.255770@e9g2000prf.googlegroups.com>
On Oct 19, 5:02 pm, red floyd <no.s...@here.dude> wrote:

Zilla wrote:

I put everything in one file for ease of use; also I have #include
<*.h> files instead of the <*> since my compiler is pre-ANSI C so it
needs the .h

#include <iostream.h>
#include <iomanip.h>
#include <string.h>

class Cmd {
public:
   virtual ~Cmd() {}
   char* printCmd()
   {
      return _name;
   }
protected:
   Cmd() {}
   char _name[16];
};

class ACmd : public Cmd {
public:
   static Cmd* getInstance()
   {
      if (!_instance) {
         _instance=new ACmd;
      }
      return _instance;
   }
   ~ACmd() {}
private:
   ACmd()
   {
      strcpy(_name, "ACmd");
   }
   static Cmd* _instance;
};

class BCmd : public Cmd {
public:
   static Cmd* getInstance()
   {
      if (!_instance) {
         _instance=new BCmd;
      }
      return _instance;
   }
   ~BCmd() {}
private:
   BCmd()
   {
      strcpy(_name, "ACmd");


I suspect your error lies here.

   }
   static Cmd* _instance;
};

typedef struct {
   Cmd* cmd;
} CmdS;- Hide quoted text -


- Show quoted text -- Hide quoted text -

- Show quoted text -


How? ACmd and BCmd are singletons, and that's how one codes one. See
Design Patterns book.

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