Conflicting declaration of objects. Need Solution Please

[VictorN]

Well, I have to tell you again (and it is the last time!):
Please, post properly formatted code with indentations and within Code tags!

And not just a couple of lines but your actual code (or code snippet) that we will be able to compile and test.
Note that the code you have posted in the post#12 has nothing to do with the one in your OP!

[fsixteen]

Code after edit

 
#include <iostream>
#include <typeinfo>

using namespace std;

/*the Command interface*/
class Command 
{
public:
          template <typename t>
          virtual void execute(t obj)=0;

          template <typename T>
          friend bool operator ==( T left, T right );
};

template <typename T>
bool operator==( T left, T right ){
          return (left == right);
                                            }

/*Receiver class*/
class Light {

public:
               Light() { }

               void turnOn() {
                 
                   cout << "The light is on" << endl;
                                  }


              void turnOff() {
                 cout << "The light is off" << endl;
                                 }
};

class Fan {

public:
               Fan() { }

              void turnOn() {

                 cout << "The Fan is on" << endl;
                                 }

             void turnOff() {

                cout << "The Fan is off" << endl;
                                }
};

/*the Command for turning on the light*/

class FlipUpCommand: public Command {

public:
              template <typename t>
              FlipUpCommand(t myobject) {
                       if (myobject == theLight){
                       theLight=myobject;
                       execute(theLight);
                                                       }
                    if (myobject = theFan){
                    theFan = myobject; 
                    execute(theLight);
                                                } 

}

               template <typename t>
               virtual void execute(t obj){
               obj.turnOn();
                                                  }

public:
           Light theLight;
           Fan   theFan;
};


class FlipDownCommand: public Command {

public:
                  template <typename t>
                  FlipUpCommand(t myobject){
                      if (myobject == theLight){
                       theLight=myobject;
                       execute(theLight);
                                                 }
                    if (myobject = theFan){
                      theFan = myobject; 
                      execute(theLight);
                                                   } 

                                     }

         template <typename t>
         virtual void execute(t obj) {
               obj.turnOff();
                                            }

public:
      Light theLight;
      Fan   theFan;
};



class Switch {
public:
Switch(Command& flipUpCmd, Command& flipDownCmd):flipUpCommand(flipUpCmd),flipDownCommand(flipDownCmd)
{

}

void flipUp()
{
flipUpCommand.execute();
}

void flipDown()
{
flipDownCommand.execute();
}

public:
Command& flipUpCommand;
Command& flipDownCommand;
};


/*The test class or client*/

int main() 
{


void *myobj = NULL;
Light *myLight;
Fan *myFan;

int choice;
cout<<"Select Light (1): ";
cout<<"Select Fan (2): ";
cin>>choice;

   if (choice ==1) {

        Light *myLight = new Light();
        myobj = (void*)myLight;
                      }
    if (choice ==2){
      Fan *myFan = new Fan();
      myobj = (void*)myFan;
                        }

FlipUpCommand switchUp(*myobj);
FlipUpCommand switchUp(*myobj);
FlipDownCommand switchDown(*myobj);
Switch s(switchUp, switchDown);

cout<<" ON (1), OFF(2) :";
cin>>choice; 
    if(choice ==1){
       s.flipUp();
                       }
    if(choice==2){
      s.flipDown();
                     }


getch();
}

[VictorN]

Well, I put your code into file temp.cpp and tried to compile it in VS2010:

  temp.cpp
d:\2010 projects\temp\temp\temp.cpp(11): error C2898: 'void Command::execute(t)' : member function templates cannot be virtual
d:\2010 projects\temp\temp\temp.cpp(74): error C2898: 'void FlipUpCommand::execute(t)' : member function templates cannot be virtual
d:\2010 projects\temp\temp\temp.cpp(88): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
d:\2010 projects\temp\temp\temp.cpp(101): error C2898: 'void FlipDownCommand::execute(t)' : member function templates cannot be virtual
d:\2010 projects\temp\temp\temp.cpp(121): error C2780: 'void Command::execute(t)' : expects 1 arguments - 0 provided
          d:\2010 projects\temp\temp\temp.cpp(11) : see declaration of 'Command::execute'
d:\2010 projects\temp\temp\temp.cpp(126): error C2780: 'void Command::execute(t)' : expects 1 arguments - 0 provided
          d:\2010 projects\temp\temp\temp.cpp(11) : see declaration of 'Command::execute'
d:\2010 projects\temp\temp\temp.cpp(160): error C2100: illegal indirection
d:\2010 projects\temp\temp\temp.cpp(161): error C2100: illegal indirection
d:\2010 projects\temp\temp\temp.cpp(161): error C2374: 'switchUp' : redefinition; multiple initialization
          d:\2010 projects\temp\temp\temp.cpp(160) : see declaration of 'switchUp'
d:\2010 projects\temp\temp\temp.cpp(162): error C2100: illegal indirection
d:\2010 projects\temp\temp\temp.cpp(162): error C2664: 'FlipDownCommand::FlipDownCommand(const FlipDownCommand &)' : cannot convert parameter 1 from 'void *' to 'const FlipDownCommand &'
          Reason: cannot convert from 'void *' to 'const FlipDownCommand'
          No constructor could take the source type, or constructor overload resolution was ambiguous
d:\2010 projects\temp\temp\temp.cpp(175): error C3861: 'getch': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

So, please, fix these errors, then we could talk about your further design.