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  1. #include <tuple>
  2. #include <type_traits>
  3.  
  4. template< class T, class U = typename std::remove_cv< typename std::remove_reference< T >::type >::type >
  5. struct remove_const_and_reference : remove_const_and_reference< U >
  6. {
  7. };
  8.  
  9. template< class T >
  10. struct remove_const_and_reference< T, T >
  11. {
  12.   typedef T type;
  13. };
  14.  
  15. class A
  16. {
  17. public:
  18.   template< class Ret, class... A >
  19.   void Call( Ret f( A... ) ) { CallCore( f ); }
  20.  
  21.   template< class Ret, class Obj, class... A >
  22.   void Call( Ret( Obj::*f )( A...) ) { CallCore( f ); }
  23.  
  24. private:
  25.   template< class Ret, class... A >
  26.   void CallCore( Ret f( A... ) )
  27.   {
  28.     using tuple_t = std::tuple< typename remove_const_and_reference< A >::type... >;
  29.   }
  30.  
  31.   template< class Ret, class Obj, class... A >
  32.   void CallCore( Ret( Obj::*f )( A...) )
  33.   {
  34.     using tuple_t = std::tuple< typename remove_const_and_reference< A >::type... >;
  35.   }
  36. };
  37.  
  38. template< class T, class... A >
  39. T* New( A&&... args )
  40. {
  41.   return new T( std::forward< A >( args )... );
  42. }
  43.  
  44. class B
  45. {
  46. public:
  47.   template< class T, class... A >
  48.   void RegisterConstructor()
  49.   {
  50.     a.Call< T* >( New< T, A... > );
  51.   }
  52.  
  53.   template< class Fun >
  54.   void Register( Fun f )
  55.   {
  56.     a.Call( f );
  57.   }
  58.  
  59. private:
  60.   A a;
  61. };
  62.  
  63. struct Foo
  64. {
  65.   Foo(){}
  66.   ~Foo(){}
  67.   void FunA( int ){}
  68. };
  69.  
  70. void FunB( int ){}
  71.  
  72. int main()
  73. {
  74.   B b;
  75.   b.Register( FunB );
  76.   b.Register( &Foo::FunA );
  77.   b.RegisterConstructor< Foo >();
  78. }
Success #stdin #stdout 0s 3340KB
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https://ideone.com/7X9chQ
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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