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  1. #include <cstddef>
  2.  
  3. template<size_t n>
  4. struct counterNumber {
  5.     char data[n+1];
  6. };
  7.  
  8. template<size_t index, size_t val>
  9. counterNumber<val> magic(counterNumber<index>, counterNumber<val>);
  10.  
  11. #define COUNTER_READ() \
  12.     (sizeof( \
  13.         magic(counterNumber<1>(), \
  14.         	magic(counterNumber<2>(), \
  15.         		magic(counterNumber<4>(), \
  16.         			magic(counterNumber<8>(), \
  17.         				magic(counterNumber<16>(), \
  18.         					magic(counterNumber<32>(), \
  19.         						magic(counterNumber<64>(), \
  20.         							magic(counterNumber<128>(), counterNumber<0>())))))))))-1)
  21.  
  22. #define COUNTER_INC() \
  23.     counterNumber<COUNTER_READ()+1> magic( \
  24.         counterNumber<(COUNTER_READ()+1)&~COUNTER_READ()>, \
  25.         counterNumber<(COUNTER_READ()+1)&COUNTER_READ()>)
  26.  
  27. #include <iostream>
  28. using namespace std;
  29. #define TO_STRING(x) #x
  30.  
  31.  
  32. #define REG_FUNCTIONAL(headFunction) \
  33.     template<> \
  34.     constexpr auto foo< COUNTER_READ() >() \
  35.     { \
  36.         return TO_STRING(headFunction); \
  37.     } \
  38.     COUNTER_INC(); \
  39.     headFunction
  40.  
  41. template<size_t n>
  42. constexpr auto foo(void){return "";}
  43.  
  44.  
  45. REG_FUNCTIONAL(void function(int a)){(void)a;}
  46. REG_FUNCTIONAL(void function1(int a)){(void)a;}
  47.  
  48.  
  49. 	// your code goes here
  50. template<size_t n>
  51. std::string callFoo()
  52. {
  53.     return std::string(foo<n>())+callFoo<n-1>();
  54. }
  55.  
  56. template<>
  57. std::string callFoo<0>()
  58. {
  59.     return std::string(foo<0>());
  60. }
  61.  
  62. int main() {
  63. 	std::cout<<callFoo<COUNTER_READ()-1>();
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 3412KB
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void function1(int a)void function(int a)
https://ideone.com/bASDDc
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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