ViCToR * ViCToR_create(ViCToR *);
ViCToR * ViCToR_delete(ViCToR *);

ViCToR_set( dest , x , y );
ViCToR_cpy( dest , source );
ViCToR_sub( dest , source , source );
ViCToR_add( dest , source , source );
ViCToR_mul( dest , source , source );
ViCToR_div( dest , source , source );
ViCToR_neg( dest , source );
