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  1. #include <iostream>
  2. #include <unordered_map>
  3. #include <functional>
  4.  
  5. const std::unordered_map<char, std::function<int(int, int)>> operations = {
  6.     {'+', [](int a, int b){ return a + b; }},
  7.     {'-', [](int a, int b){ return a - b; }},
  8.     {'*', [](int a, int b){ return a * b; }},
  9.     {'/', [](int a, int b){ return a / b; }},
  10.     {'%', [](int a, int b){ return a % b; }},
  11.     // etc...
  12. };
  13.  
  14. int main() {
  15. 	char a = '+';
  16. 	auto op = operations.at(a);
  17. 	int b = op(2, 2);
  18. 	std::cout << b << std::endl;
  19.  
  20. 	a = '-';
  21. 	op = operations.at(a);
  22. 	b = op(2, 2);
  23. 	std::cout << b << std::endl;
  24.  
  25. 	//...
  26.  
  27. 	return 0;
  28. }
Success #stdin #stdout 0s 5292KB
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https://ideone.com/3fKgIT
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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