C + + A class contains a class B pointer, Class B contains a class A pointer to the case

#include <stdio.h>classBclass;classaclass{ Public: Friend Bclass; voidfunc () {PB-FUNCB (); }    intdata; Bclass*PB;};classbclass{ Public: Friend AClass; voidFUNCB () {p-func (); } AClass*p; intdata;};intMain () {return 0;}

Compilation Result:

1>------Started Build: Project: ABC, configuration: Debug Win32------
1> main.cpp
1>d:\cpptest\abc\abc\main.cpp: Error C2027: "Bclass" is used with undefined type
1> D:\cpptest\abc\abc\main.cpp (5): See Declaration of "Bclass"
1>d:\cpptest\abc\abc\main.cpp: Error C2227: The left side of "->FUNCB" must point to class/struct/union/generic type

Class A contains a pointer to Class B, and the method calls the Class B method, Class B contains a class of pointers, also called a method, did not take half a day

Find the Great God, said: Although you affirm the class B, but, the compiler just know there is this thing, and there is no way to implement, to put separate, header file one, CPP a

 class   Bclass;  class   aclass{ public      void   Func ();     int   data; Bclass  * PB;};  class   bclass{ public      void   Funca () {p ->func ();    } aclass  * P;  int   data;};  

Put the implementation in the CPP

#include"Aclass.h"void  Aclass::func () {    PB-andFunca ();}

Perfect solution.

Inspire C + + to write things, or to separate the class into two inside, the first file, CPP a

C + + A class contains a class B pointer, Class B contains a class A pointer to the case