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  1. #include <type_traits>
  2. #include <iostream>
  3.  
  4.  
  5. template<size_t i>
  6. struct best_type {
  7.     typedef typename std::conditional<
  8.         (i <= 8),
  9.         uint8_t,
  10.         typename std::conditional<
  11.             (i <= 16),
  12.             uint16_t,
  13.             typename std::conditional<
  14.                 (i <= 32),
  15.                 uint32_t,
  16.                 uint64_t
  17.             >::type
  18.         >::type
  19.     >::type type;
  20. };
  21.  
  22.  
  23. int main() {
  24.     std::cout << sizeof(best_type<2>::type) << std::endl;
  25.     std::cout << sizeof(best_type<8>::type) << std::endl;
  26.     std::cout << sizeof(best_type<15>::type) << std::endl;
  27.     std::cout << sizeof(best_type<17>::type) << std::endl;
  28. }
Success #stdin #stdout 0s 2884KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/kZ8mu
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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