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  1. #include <cstdlib>
  2.  
  3. #include <iostream>
  4. #include <typeinfo>
  5.  
  6. #include <cxxabi.h>
  7.  
  8. class AutoRegister
  9. {
  10.     class InitializerPrivate
  11.     {
  12.     };
  13.  
  14. public:
  15.     explicit AutoRegister(const InitializerPrivate&)
  16.     {
  17.     }
  18.  
  19.     template <class Child>
  20.     class Initializer : public InitializerPrivate
  21.     {
  22.         class StaticInit
  23.         {
  24.         public:
  25.             StaticInit()
  26.             {
  27.                 int status;
  28.                 char *childName = abi::__cxa_demangle(typeid(Child).name(), 0, 0, &status);
  29.                 std::cout << "Registering child: " << childName << std::endl;
  30.                 // XXX: qRegisterMetaType<EventFoo>("EventFoo");
  31.                 std::free(childName);
  32.             }
  33.  
  34.             void nop() const
  35.             {
  36.  
  37.             }
  38.         };
  39.  
  40.         static const StaticInit _init;
  41.  
  42.     public:
  43.         explicit Initializer()
  44.         {
  45.             _init.nop();
  46.         }
  47.     };
  48. };
  49.  
  50. class BaseEvent : protected virtual AutoRegister
  51. {
  52. public:
  53.     explicit BaseEvent() : AutoRegister(Initializer<BaseEvent>())
  54.     {
  55.     }
  56. };
  57.  
  58. class EventFoo : public BaseEvent
  59. {
  60. public:
  61.     explicit EventFoo() : AutoRegister(Initializer<EventFoo>())
  62.     {
  63.     }
  64. };
  65.  
  66. class EventBar : public BaseEvent
  67. {
  68. public:
  69.     explicit EventBar() : AutoRegister(Initializer<EventBar>())
  70.     {
  71.     }
  72. };
  73.  
  74. template<class T>
  75. const typename AutoRegister::Initializer<T>::StaticInit AutoRegister::Initializer<T>::_init = typename AutoRegister::Initializer<T>::StaticInit();
  76.  
  77. int main(void)
  78. {
  79.     return 0;
  80. }
  81.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
Registering child: BaseEvent
Registering child: EventFoo
Registering child: EventBar
https://ideone.com/sFvecp
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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