Why am I getting this redefinition of class error

Question

Apologies for the code dump   gameObject cpp    include  gameObject h  class gameObject       private      int x      int y      public      gameObject             x   0      y   0             gameObject int inx  int iny                x   inx          y   iny              gameObject                          int add                 return x y             gameObject h   class gameObject       private      int x      int y      public      gameObject         gameObject int inx  int iny        gameObject        int add         Errors         terrac  Debug      C  terrac gameObject cpp 4 error  redefinition of  class gameObject   C  terrac gameObject h 3 error  previous definition of  class gameObject         Build finished  2 errors  0 warnings        I can t figure out what s wrong  Help

User · Answer

Include a few  ifndef name  define name  endif preprocessor that should solve your problem  The issue is it going from the header to the function then back to the header so it is redefining the class with all the preprocessor  include  multiple times

User · Answer

You re defining the class in the header file  include the header file into a   cpp file and define the class a second time because the first definition is dragged into the translation unit by the header file  But only one gameObject class definition is allowed per translation unit   You actually don t need to define the class a second time just to implement the functions  Implement the functions like this    include  gameObject h   gameObject  gameObject int inx  int iny        x   inx      y   iny     int gameObject  add         return x y      etc

User · Answer

If you are having issues with templates or you are calling the class from another  cpp file  try using   pragma once  in your header file

User · Answer

add in header files   pragma once

User · Answer

the implementation in the cpp file should be in the form  gameObject  gameObject             x   0      y   0        gameObject  gameObject int inx  int iny                x   inx          y   iny         gameObject   gameObject                      int gameObject  add                 return x y          not within a  class gameObject     definition block

User · Answer

You re defining the same class twice is why   If your intent is to implement the methods in the CPP file then do so something like this   gameObject  gameObject         x   0      y   0    gameObject   gameObject              int gameObject  add             return x y

User · Answer

You define the class gameObject in both your  cpp file and your  h file  That is creating a redefinition error   You should define the class  ONCE  in ONE place   convention says the definition is in the  h  and all the implementation is in the  cpp   Please help us understand better  what part of the error message did you have trouble with   The first part of the error says the class has been redefined in gameObject cpp The second part of the error says the previous definition is in gameObject h   How much clearer could the message be

User · Answer

You should wrap the  h file like so    ifndef Included NameModel H   define Included NameModel H     Existing code goes here   endif

[c++] Why am I getting this redefinition of class error?

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