#define FILL_DIRECTIVE(z,n,data) if(n==3)params[3]=1;else params[n]=value[n];
#define FILL_PARAMS float params[4]; BOOST_PP_REPEAT(4,FILL_DIRECTIVE,)
    property_readwrite_ex(Vectormath::Aos::Vector3,Ambient,
                          {},//getter
                          {//pre setter
                            FILL_PARAMS
                            glLightfv(GL_LIGHT0,GL_AMBIENT, params);
                          },{})
    property_readwrite_ex(Vectormath::Aos::Vector3,Diffusion,
                          {},//getter
                          {//pre setter
                            FILL_PARAMS
                            glLightfv(GL_LIGHT0,GL_AMBIENT, params);
                          },{})
#undef FILL_DIRECTIVE
#undef FILL_PARAMS