Can Anyone Explain this Error? (OpenGL)

[Shamino]

Heres the Code


Renderer.h

#include <vector>
#include "Vector3.h"

using namespace std;

struct	BasicTri
{
	Vector3 P1, P2, P3;
	int	Texture;


	BasicTri(const BasicTri& t)
	{
		P1 = t.P1;
		P2 = t.P2;
		P3 = t.P3;
		Texture = t.Texture;
	}

	BasicTri& operator=(const BasicTri& t)
	{
		if( &t != this ){
			P1 = t.P1;
			P2 = t.P2;
			P3 = t.P3;
			Texture = t.Texture;
		}
		return *this;
	}
};

std::vector<BasicTri*>	mBasicTri;

class GLRenderer
{
public:

	void	AddBasicTriToRenderer(BasicTri* t)
	{

		// then add to the vector
		mBasicTri.push_back(t);
	}

	void	RenderBasicTriangles(void);

};

And Renderer.cpp

#include "Renderer.h"

And this is the error:

--------------------Configuration: NeHeGL - Win32 Debug--------------------
Compiling...
Renderer.cpp
Example.cpp
Linking...
Renderer.obj : error LNK2005: "class std::vector<struct BasicTri *,class std::allocator<struct BasicTri *> > mBasicTri" (?mBasicTri@@3V?$vector@PAUBasicTri@@V?$allocator@PAUBasicTri@@@std@@@std@@A) already defined in Example.obj
Debug/NeHeGL.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

NeHeGL.exe - 2 error(s), 0 warning(s)

I've been working at this for hours, even rebuilt program from scratch, what is it?

[Dante Shamest]

Are you including Renderer.h in another file?

You've defined a global in Renderer.h

std::vector<BasicTri*>	mBasicTri;

and if you include Renderer.h in more than one source files (.cpp), you'll get a multiple definition error.

[Shamino]

Fixed

made it extern in the header

Declared it in the CPP