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  1. #include <stdio.h>
  2.  
  3. // B.h =================
  4.  
  5. class A;
  6. /* 内部クラスは前方宣言できない
  7. class A::Inner;
  8. */
  9.  
  10. class B
  11. {
  12. public:
  13. 	void Func( A* p );
  14. 	/* 前方宣言してない(できない)のでエラー
  15. 	void Func( A::Inner* p ){}
  16. 	*/
  17. 	template<class T>
  18. 	void Func( T* p );
  19. };
  20.  
  21. // B.cpp =================
  22.  
  23. class A
  24. {
  25. public:
  26. 	class Inner
  27. 	{};
  28. };
  29.  
  30. void B::Func( A* p ){ printf( "Func( A* p )\n" ); }
  31.  
  32. template<>
  33. void B::Func<A::Inner>( A::Inner* p ){ printf( "Func<A::Inner>( A::Inner* p )\n" ); }
  34.  
  35. int main( void )
  36. {
  37. 	B b;
  38. 	A a;
  39. 	A::Inner inner;
  40. 	b.Func( &a );
  41. 	b.Func( &inner );
  42.     return 0;
  43. }
Success #stdin #stdout 0s 3296KB
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Func( A* p )
Func<A::Inner>( A::Inner* p )
https://ideone.com/fbf1bI
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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