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  1. #include <iostream>
  2. #include <typeinfo>
  3. #include <type_traits>
  4.  
  5.  
  6. template <int SZ>
  7. class Internal 
  8. {
  9.     char arr[SZ];
  10. };
  11.  
  12. template < int SZ>
  13.  struct  helper 
  14.  {
  15.  typedef typename std::conditional<(SZ > 1000 && SZ <9999),Internal<SZ>,Internal<1> >::type type;
  16.  };
  17.  
  18.  template < int SZ>
  19.  struct A : public  helper<SZ>::type
  20.  {
  21.  	typedef  typename helper<SZ>::type base;
  22.  };
  23.  
  24. int main() {
  25.  std::cout << typeid(A<1024>::base).name() << std::endl;
  26.  A<1024> x;
  27.  std::cout << typeid(A<-34>::base).name() << std::endl;
  28.  A<-34> y;
  29.  return 0;
  30. }
Success #stdin #stdout 0s 3340KB
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8InternalILi1024EE
8InternalILi1EE
https://ideone.com/sODOEG
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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