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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. class someOtherClass
  5. {
  6. public:
  7.     someOtherClass()
  8.         : a(0)
  9.         , b(1.0f)
  10.         , c(2.0)
  11.     {}
  12.     int a;
  13.     float b;
  14.     double c;
  15. };
  16.  
  17. class logger
  18. {
  19. public:
  20.     // Specific case for handling a complex object
  21.     logger& operator << ( const someOtherClass& rObject )
  22.     {
  23.         std::cout << rObject.a << std::endl;
  24.         std::cout << rObject.b << std::endl;
  25.         std::cout << rObject.c << std::endl;
  26.         return *this;
  27.     }
  28.  
  29.     // [other class specific implementations]
  30.  
  31.     // Template for handling pointers which might be null
  32.     template< typename _T >
  33.     logger& operator << ( const _T* pBar )
  34.     {
  35.         if ( pBar )
  36.         {
  37.             std::cout << "Pointer handled:" << std::endl;
  38.             return *this << *pBar;
  39.         }
  40.         else
  41.             std::cout << "null" << std::endl;
  42.         return  *this;
  43.     }
  44.  
  45.     // Template for handling simple types.
  46.     template< typename _T , typename = typename ::std::enable_if_t<!std::is_pointer<_T>::value> >
  47.     logger& operator << ( const _T& rBar )
  48.     {
  49.         std::cout << "Reference: " << rBar << std::endl;
  50.         return *this;
  51.     }
  52. };
  53.  
  54. int main(int argc, char* argv[])
  55. {
  56.     logger l;
  57.     someOtherClass soc;
  58.     someOtherClass* pSoc = &soc;
  59.     l << soc;
  60.     l << pSoc;
  61.     pSoc = nullptr;
  62.     l << pSoc;
  63.     return 0;
  64. }
Success #stdin #stdout 0s 16064KB
comments ()
stdin 
Standard input is empty
stdout 
0
1
2
Pointer handled:
0
1
2
null
https://ideone.com/3dbYzj
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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