Object array. Probelm accessing methods

This is a discussion on Object array. Probelm accessing methods within the C++ Programming forums, part of the General Programming Boards category; Hi, in the program I am writing I have placed several objects of the same class in an array. When ...

  1. #1
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    Object array. Probelm accessing methods

    Hi, in the program I am writing I have placed several objects of the same class in an array. When I try and access a public method of one of the objects from a different .cpp file, it displays several error messages even though the object array is global. I have abridged versions of the files below. Any ideas?

    Code:
    // main .cpp file
    #include <iostream>
    #include "Room.h"
    
    using namespace std;
    
    CRoom Rooms[14]={1,2,3,4,5,6,7,8,9,10,11,12,13,14};
    
    void main()
    {
    
    	title();
    
    	Rooms[1].set_door(0,2,0,1);
    	Rooms[2].set_door(7,1,9,11);
    	Rooms[3].set_door(9,0,0,10);
    	Rooms[4].set_door(0,10,0,0);
    
    // ...etc etc
    
    // another .cpp file
    
    #include <iostream>
    #include "Player.h"
    
    using namespace std;
    
    CPlayer::~CPlayer()
    {
    
    }
    
    void CPlayer::move(int direction)
    {
         Rooms[1].set_door(1,2,3,4); 
    
    // errors occurs when this line is include e.g.
    // 'Rooms' : undeclared identifier
    // subscript requires array or pointer type
    // left of '.set_door' must have class/struct/union type
    
    }

  2. #2
    Toaster Zach L.'s Avatar
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    In your other source file, put:
    extern CRoom Rooms[14];
    This lets the compiler know that Rooms has been declared and defined elsewhere.

    Also, 'void main' is bad, 'int main' is good. For a thorough explanation of this, consult the FAQ.

    Cheers

  3. #3
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    erm, I get less errors now. Here the code as it looks now:

    Code:
    #include <iostream>
    #include "Player.h"
    
    extern CRoom Rooms[14]; // newly added
    
    using namespace std;
    
    CPlayer::~CPlayer()
    {
    
    }
    
    void CPlayer::move(int direction)
    {
          Rooms[1].set_door(1,2,3,4);
    }
    Now the errors I get are:

    missing ';' before identifier 'Rooms'
    unexpected end of file found

    I tried editing it and moving it around. Am I just being a bit stupid and putting it in the wrong place or something?
    Last edited by Bean; 05-02-2004 at 09:54 PM.

  4. #4
    and the hat of wrongness Salem's Avatar
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    > extern CRoom Rooms[14]; // newly added
    Put this in rooms.h

    Then
    #include "rooms.h"
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  5. #5
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    ah... I was being a bit stupid. Works perfectly now. Thanks!

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