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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<int i_find, int... i_rest>
  5. struct contains;
  6.  
  7. template<int i_find, int i_head, int... i_rest>
  8. struct contains<i_find, i_head, i_rest...> : contains<i_find, i_rest...> {};
  9.  
  10. template<int i_find, int... i_rest>
  11. struct contains<i_find, i_find, i_rest...> : std::true_type {};
  12.  
  13. template<int i_find>
  14. struct contains<i_find> : std::false_type {};
  15.  
  16. int main() {
  17. 	printf("contains 0: %i\n", contains<0, 1,2,3,4>() ? 1 : 0);
  18. 	printf("contains 1: %i\n", contains<1, 1,2,3,4>() ? 1 : 0);
  19. 	printf("contains 2: %i\n", contains<2, 1,2,3,4>() ? 1 : 0);
  20. 	printf("contains 3: %i\n", contains<3, 1,2,3,4>() ? 1 : 0);
  21. 	printf("contains 4: %i\n", contains<4, 1,2,3,4>() ? 1 : 0);
  22. 	printf("contains 5: %i\n", contains<5, 1,2,3,4>() ? 1 : 0);
  23. 	// your code goes here
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
stdout
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contains 0: 0
contains 1: 1
contains 2: 1
contains 3: 1
contains 4: 1
contains 5: 0
https://ideone.com/6A83T6
Contains (template pack)
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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