Global objects in seperate file

[Icarus247]

I'm trying to make a simple program that uses global class objects. The only problem is that I can't seem to define them in a separate file. eg:

"classA.h"
Class classA
{
    public:
        int x;
        int y;
    private:
        int getX(){return x;};
        int getY(){return y;};
}objectA;

"main.cpp"
#include "classA.h"

void main()
{
    objectA.getX();
}

That's basically how I'd like my program to work, but it throws out an error every time. I'm not 100% sure of the exact error, but it's something like "objectA already defined in main.cpp"

Is it possible to do this? Or do I have to declare global objects in the main file?

[hamsterman]

either

//class.h
class A{ ... };

//class.cpp
#include "class.h"
A object;

//main.cpp
#include "class.h"
extern A object
int main{ ... }

or

//class.h
class A{ ... };
class Global{
   static A object;
};

//class.cpp
#include "class.h"
A Global::object;

//main.cpp
#include "class.h"
int main(){ ... } // note that to access object now you have to write Global::object 

the second one is preferred.

[cran]

The use of the object seems to only be in main, so defining the object in main will suffice. No need for overkill....

"classA.h"
Class classA
{
    public:
        int x;
        int y;
    private:
        int getX(){return x;};
        int getY(){return y;};
}; // <-- don't create the object here

"main.cpp"
#include "classA.h"

void main()
{
    classA objectA; // <-- now it'll only be defined in main
    objectA.getX();
}

If you need to use it outside of main, pass it as a parameter. No need for a global variable.

-- edit: but if you absolutely have to have the global, then you can do like hamsterman

[Icarus247]

Thanks to both of you! Great help!