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  1. #include <cstddef>
  2. #include <stdexcept>
  3.  
  4. constexpr std::uint64_t fnv(const char* p, std::size_t len,
  5.                             std::uint64_t h = 0xcbf29ce484222325) {
  6.     return len == 0? h : fnv(p+1, len-1, (h ^ *p) * 0x00000100000001b3);
  7. }
  8.  
  9. constexpr std::uint64_t operator "" _fnv( char const* str, std::size_t len ) {
  10.     return fnv(str, len);
  11. }
  12.  
  13. #include <iostream>
  14. #include <string>
  15.  
  16. int main()
  17. {
  18.     for (std::string str; getline(std::cin, str);) {
  19.         switch(fnv(str.data(), str.size()))
  20.         {
  21.             case "Hallo"_fnv:
  22.                 std::cout << "Welt!";
  23.                 break;
  24.             case "Welt"_fnv:
  25.                 std::cout << "Hallo!";
  26.                 break;
  27.             default:
  28.                 std::cout << "Nochmal probier'n!";
  29.         }
  30.     }
  31. }
Success #stdin #stdout 0s 3232KB
comments (?)
stdin
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Hallo
Welt
stdout
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Welt!Hallo!
https://ideone.com/tMC7Ow
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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