Rules of the class

LAURENT* · 05-26-2014

Hello everyone, If you read my previous thread you may have hear me say I would provide a demo of my tic tact toe game but, I decided not to because I didn't really think it was that cool. It just tic tact toe with a dumb AI. Something I've been working on that more interesting is my isometric game play. I put almost everything in a class but, now I'm getting a error I don't know how to approach.

The error is called LNK2005 from visual studios 2010. It's saying that my constructor & destructor Game(); ~Game(); are already defined in another cpp file. Originally when I started I had 2 cpp files with one header to hold the class Game and I only used the constructor Game::Game() ; in one cpp file. Now I'm doing this in two cop files. Is there anyway to make the compiler not confused or how would you suggest I organize the code better?

**laserlight** · 05-26-2014

Example code that demonstrates the problem would be good.

LAURENT* · 05-26-2014

the code is very heavy and not organized but this is the only error I'm getting. I had a lot of errors everywhere but that has been taken care of.

I did something like this.

Header file
Class
{
Game();
~Game();
}

CPP file 1
//Declarations
Game:Game()
{
//variable = value;
}

CPP file 2
//Declarations
Game::Game();
{
//variables = value;
}

**Elysia** · 05-26-2014

Post a minimal compilable example that demonstrates the problem. Strip down the code until only the specific error you have remains and post it here.

**laserlight** · 05-26-2014

Originally Posted by LAURENT*

I did something like this.

Then don't. You defined the default constructor for Game in both file 1 and file 2, thus violating the one definition rule. Pick the definition in one file and delete the definition in the other.

LAURENT* · 05-26-2014

Originally Posted by laserlight

Then don't. You defined the default constructor for Game in both file 1 and file 2, thus violating the one definition rule. Pick the definition in one file and delete the definition in the other.

Oh that the rule I missed thanks. Maybe I can create a new CPP file and put the default in it and link all cop files to it. Can you make a default constructor inside a header file? This may get too complex.

**laserlight** · 05-26-2014

Originally Posted by LAURENT*

Can you make a default constructor inside a header file?

Yes, you can define the default constructor in a header file, so long as you either define it within the class definition, or declare it as inline.

LAURENT* · 05-26-2014

Hey you got a link to how this is done? I wanna try it. Also I kinda forgot what class definition meant.....

**laserlight** · 05-26-2014

Originally Posted by LAURENT*

Hey you got a link to how this is done? I wanna try it.

You would probably have seen it (as in defining a member function within a class definition) in whatever materials you are using to learn C++.

Originally Posted by LAURENT*

Also I kinda forgot what class definition meant.....

The definition of a class named X looks like:

Code:

class X
{
    // ...
};

LAURENT* · 05-26-2014

Thanks now the code work and I found new error. It's just game logic I messed up, no big deal.

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