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  1. #include <iostream>
  2. using namespace std;
  3. namespace detail
  4. {
  5.     template<size_t Count>
  6.     inline constexpr size_t countof(const char(&string)[Count])
  7.     {
  8.         return Count - 1;
  9.     }
  10.  
  11.     template<typename T>
  12.     struct ascii_hash_t
  13.     {
  14.         template<typename L>
  15.         static constexpr T f(L const& data, T hash, size_t i = 0)
  16.         {
  17.             return i < countof(data) ? f(data, (hash & (~0u)) ^ (hash << 7) ^ T(data[i]), i + 1) : hash;
  18.         }
  19.     };
  20.  
  21.     template<typename T, typename L>
  22.     inline constexpr T generate_ascii_hash(L const& data)
  23.     {
  24.         return detail::ascii_hash_t<T>::f(data, 0);
  25.     }
  26. };
  27.  
  28. template<size_t Count>
  29. inline constexpr uint32_t hash_constexpr(const char(&string)[Count])
  30. {
  31.     return detail::generate_ascii_hash<uint32_t>(string);
  32. }
  33. int main() {
  34. 	// your code goes here
  35. 	constexpr uint32_t asd = hash_constexpr("asdasd");
  36. 	return 0;
  37. }
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https://ideone.com/heFuFP
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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