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  1. #include <unordered_map>
  2. #include <random>
  3. #include <iostream>
  4.  
  5. template <typename Numeric, typename Divisor>
  6. inline constexpr bool isDivisibleBy(Numeric numeric, Divisor divisor)
  7. {
  8.     return ((numeric >= divisor) && ((numeric % divisor) == 0));
  9. }
  10.  
  11. constexpr auto isEven = [](int test) -> bool { return isDivisibleBy<int, int>(test, 2); };
  12.  
  13. int main()
  14. {
  15.     std::mt19937 randomEngine{std::random_device{}()};
  16.     std::uniform_int_distribution<int> randomDistribution{0, 100};
  17.     std::unordered_map<int, bool> hash{};
  18.     for (int i = 0; i < 10; i++) {
  19.         int randomNumber{randomDistribution(randomEngine)};
  20.         hash.emplace(randomNumber, isEven(randomNumber));
  21.     }
  22.     for (auto &hash : hash) {
  23.         std::cout << "key \"" << hash.first << "\" is " << (hash.second ? "even" : "odd") << std::endl;
  24.     }
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
key "25" is odd
key "35" is odd
key "86" is even
key "97" is odd
key "53" is odd
key "12" is even
key "19" is odd
key "52" is even
key "41" is odd
key "73" is odd
https://ideone.com/DtRIZB
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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