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how to fix cyclic include of header files?

hello, i have 2 classes (the character class, and another class) which both depend on each other and i have functions which get each other in the parameters so i require to include the class in the character.h and in the class.h i need the character.h. but i cannot compile because of the cyclic include loop that was created. how can i fix it?

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asked Jul 11 '14 at 04:20 PM in C++ Programming

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mdluffy
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The standard solution is to make sure that headers are properly #if guarded, and then to use forward declarations.

 // a.h
 #if !defined(a_h)
 #define a_h
 
 class B; // forward declaration
 
 class A {
 public:
     void doSomethingWithB(B &b);
 };
 
 #endif // a_h
 
 // b.h
 #if !defined(b_h)
 #define b_h
 
 class A; // forward declaration
 
 class B {
 public:
   void doSomethingWithA(A &a);
 };
 
 #endif // b_h
 

Note that it is impossible to make both "doSomethingWithA()" and "doSomethingWithB()" be inline defined.

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answered Jul 11 '14 at 05:33 PM

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jwatte
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avatar image mdluffy Jul 11 '14 at 05:37 PM

oh thank you very much!

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