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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4. #include <memory>
  5.  
  6. struct in 
  7. {
  8.  std::shared_ptr<void> ptr;
  9.  size_t hash_type;
  10.  void add_strings(){}
  11.  
  12.  
  13.  template<typename T, typename... Args>
  14.  void add_strings(T value, Args... args) {
  15.  	std::vector<T> &vec = *(std::vector<T>*)ptr.get();
  16.  	vec.push_back(value);
  17.  	add_strings(args...);
  18.  }
  19.  
  20.  template<typename... Args>
  21.  void add_strings(char const*const value_ptr, Args... args) {
  22.  	std::vector<std::string> &vec = *(std::vector<std::string>*)ptr.get();
  23.  	vec.push_back(std::string(value_ptr));
  24.  	add_strings(args...);
  25.  }	
  26.  
  27.  template<typename... Args>
  28.  in(char const*const value_ptr, Args... args) { 
  29.  	hash_type = typeid(std::string).hash_code();
  30.  	ptr = std::make_shared<std::vector<std::string>>(0);
  31.  	add_strings(value_ptr, args...);
  32.  } 
  33.  
  34.  template<typename T, typename... Args>
  35.  in(T value, Args... args) { 
  36.  	hash_type = typeid(T).hash_code();
  37.  	ptr = std::make_shared<std::vector<T>>(0);
  38.  	add_strings(value, args...);
  39.  }
  40. };
  41.  
  42. template<typename T>
  43. bool operator==(T const& str, in const& val) {
  44. 	if(val.hash_type == typeid(T).hash_code()) 
  45. 	{
  46. 		std::vector<T> &vec = *(std::vector<T>*)val.ptr.get();
  47.  		for(auto &i : vec) 
  48.  		{
  49.  			if(i == str)
  50.  				return true;
  51.  		}
  52. 	}
  53.  	return false;	
  54. }
  55. // -----------------------------------------------------
  56.  
  57. int main(void) 
  58. {
  59. 	std::string lang, country = "GB";
  60.  
  61. 	if (country == in ("US","GB","AU")) 
  62. 	{
  63. 		lang="en";
  64. 	}
  65.  
  66. 	if (country == in (1,2,3)) 
  67. 	{
  68. 		lang="hz";
  69. 	}
  70.  
  71. 	int a, b = 10;
  72.  
  73. 	if (b == in (1,2,10,3)) 
  74. 	{
  75. 		lang += " +100500";
  76. 	}
  77.  
  78. 	std::cout << "lang = " << lang << std::endl;
  79.  
  80. 	return 0;
  81. }
  82.  
Success #stdin #stdout 0s 3420KB
comments (?)
stdin 
Standard input is empty
stdout 
lang = en +100500
https://ideone.com/OLNtmD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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