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  1. #include <unordered_map>
  2. #include <string>
  3. #include <utility>
  4.  
  5. struct BeliefCondFunc
  6. {
  7.     using cb_type = bool(*)();
  8.     static std::unordered_map<std::string, cb_type> const FuncMap;
  9.  
  10.     static bool Greater(int A, int B)
  11.     {
  12.         return A > B;
  13.     }
  14.  
  15.     static bool Between(float A, float B, float C)
  16.     {
  17.         return A > B && A < C;
  18.     }
  19.  
  20.     template<typename ...Args>
  21.     static bool call(std::string const& key, Args&&... args){
  22.       using prototype = bool(*)(Args...);
  23.       return reinterpret_cast<prototype>(FuncMap.at(key))(std::forward<Args>(args)...);
  24.     };
  25. };
  26.  
  27. std::unordered_map<std::string, BeliefCondFunc::cb_type> const BeliefCondFunc::FuncMap {
  28.   {"Greater", reinterpret_cast<cb_type>(&BeliefCondFunc::Greater) },
  29.   {"Between", reinterpret_cast<cb_type>(&BeliefCondFunc::Between) }
  30. };
  31.  
  32. int main() {
  33. 	BeliefCondFunc::call("Greater", 1, 2);
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3468KB
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stdout 
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https://ideone.com/Ou46EP
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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