Static Member Variables of the Same Class in C++
- by helixed
I'm trying to create a class which contains a static pointer to an instance of itself. Here's an example:
A.h:
#include <iostream>
#ifndef _A_H
#define _A_H
class A {
static A * a;
};
A * a = NULL;
#endif
However, when I include A.h in another file, such as:
#include "A.h"
class B {
};
I get the following error:
ld: duplicate symbol _a in /Users/helixed/Desktop/Example/build/Example.build/Debug/Example.build/Objects-normal/x86_64/B.o and /Users/helixed/Desktop/Example/build/Example.build/Debug/Examplebuild/Objects-normal/x86_64/A.o
I'm using the Xcode default compiler on Mac OS X Snow Leopard.
Thanks,
helixed
