Namespaces and includes generate link error

Question

I was playing around with namespaces when I encountered a lnk2005 error. I can\'t figure out how to get around the error. Here\'s the error:

1>Source.obj :          


        

Answer 1

I've had the exact same problem and I found a workarroud.

chart.h becomes:

#pragma once

#include "foo.h"

class Chart{
    static int t;
    static foo l;
    class Bars
    {
        static int d;
    };
};

and define the variables in chart.cpp

int Chart::t;
foo Chart::l;
int Chart::Bars::d;

Ugly, I know, but at least the syntax is the same wherever you need to use the vars.

This way only ONE .obj file is created containing the variables which prevents the multiple definition erros.
I haven't tried if you can declare a static variable on a namespace which could solve the problem.

Edit:

P.S. this solution gives some weird errors on msvc, as if every time it is included, sections of the code reference differente variables

Tested on my own program the static-inside-namespace and it seems to work.
Example.h:

namespace sdl{
    static SDL_Surface* screen;

    static int xres = 640;
    static int yres = 480;
    static int bpp  = 32;
    static int flags = SDL_ASYNCBLIT;

};