C++ multiple definition errors in 3-way header include -

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i have 3 header files defining objects:

point3d.h

#ifndef point3d_h #define point3d_h  class ray3d; class vector3d; #include "ray3d.h" #include "vector3d.h"   class point3d {      ... }; #endif

vector3d.h

#ifndef vector3d_h #define vector3d_h   class point3d; class ray3d;  #include "ray3d.h" #include "point3d.h"   class vector3d {     ...  };  #endif

and ray3d.h

#ifndef ray3d_h #define ray3d_h   class point3d; class vector3d;  #include "point3d.h" #include "vector3d.h"   class ray3d {     ...  };  #endif

i won't include .cpp files, functions defined there.

and have class: transform.h

#ifndef transform_h #define transform_h  #include <eigen/dense> #include "../../geometry/ray3d.cpp" #include "../../geometry/point3d.cpp" #include "../../geometry/vector3d.cpp"   using eigen::matrixxd;   class transform {     ... }; #endif

and have subclass: translation.h

#ifndef translation_h #define translation_h  //#include <eigen/dense>  #include "transform.h"   //#include "../../geometry/point3d.cpp" //#include "../../geometry/vector3d.cpp" //#include "../../geometry/ray3d.cpp"  using eigen::matrixxd;   class translation : public transform {     ... }; #endif

the problem when try compile translation.cpp:

g++ transform.cpp translation.cpp

i multiple definition of function error every method in ray3d, point3d, , vector3d. can do avoid this? should including less? g++ command wrong? thanks!

i'm aware i'm doing both forward declaration , includes in first 3 headers, way compile. part of problem maybe?

you should not include cpp files in transform.h


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