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  1.  
  2. #include <iostream>
  3.  
  4. ///vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
  5. // A.h
  6. #pragma once
  7.  
  8. class B;	// 前方宣言
  9.  
  10. class A
  11. {
  12. public:
  13. 	B* obj1;
  14. };
  15. //^^^^^^^^^^^^^^^^^^^^^^^^
  16.  
  17. //vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
  18. // B.h
  19. #pragma once
  20. class B
  21. {
  22. public:
  23. 	void funcB() 
  24. 	{
  25. 		std::cout << "B::funcB()" << std::endl;
  26. 	}
  27. };
  28.  
  29. //^^^^^^^^^^^^^^^^^^^^^^^^
  30.  
  31. //vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
  32. // C.h
  33.  
  34. //#include "A.h"		// ←これのincludeを忘れてるんだろう
  35. //#include "B.h"		// ←
  36.  
  37. class C
  38. {
  39. public:
  40. 	void funcC()
  41. 	{
  42. 		A* a = new A;
  43. 		a->obj1 = new B;
  44. 		a->obj1->funcB();
  45. 	}
  46. };
  47. //^^^^^^^^^^^^^^^^^^^^^^^^
  48.  
  49. //vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
  50. // main.cpp
  51.  
  52. //#include "C.h"
  53.  
  54. int main()
  55. {
  56. 	C c;
  57. 	c.funcC();
  58. }
  59.  
Success #stdin #stdout 0s 3016KB
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Standard input is empty
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B::funcB()
https://ideone.com/rRd0H
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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