class - c++ no suitable conversion function from "Camera" to "Actor *" -

fairly new c++ so, please gentle. getting str8 point:

first actor class:

class actor { vec3 location; vec3 rotation; } 

then camera class:

class camera: public actor { float fov; } 

and controller class:

class controller { actor* pawnactor; void setpawnactor(actor* actor); } 

now problem...

considering camera derives actor tried like...

controller.setpawnactor(camera); 

...but... compiler says: no suitable conversion function "camera" "actor *" exists. of course use: void setpawnactor(camera* camera); seems pointless me create function each possible actor become 'pawnactor'. ideas???

again i'm new whole c++ thing so...

thanks time everyone.

pass &camera if camera object function expecting pointer not object .