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  1. #include <iostream>
  2. #include <string>
  3.  
  4. class ConfigPair
  5. {
  6. protected:
  7. 	std::string name;
  8. public:
  9. 	ConfigPair(const std::string &n) : name(n) { }
  10. 	virtual std::string toString() const = 0;
  11. };
  12.  
  13. class ConfigPairInt : public ConfigPair
  14. {
  15. 	int value;
  16. public:
  17. 	ConfigPairInt(const std::string &n, int v) : ConfigPair(n), value(v) { }
  18. 	std::string toString() const override { return name + ":i[" + std::to_string(value) + "]"; }
  19. };
  20.  
  21. class ConfigPairDouble : public ConfigPair
  22. {
  23. 	double value;
  24. public:
  25. 	ConfigPairDouble(const std::string &n, double v) : ConfigPair(n), value(v) { }
  26. 	std::string toString() const override { return name + ":d[" + std::to_string(value) + "]"; }
  27. };
  28.  
  29. class ConfigPairString : public ConfigPair
  30. {
  31. 	std::string value;
  32. public:
  33. 	ConfigPairString(const std::string &n, const std::string &v) : ConfigPair(n), value(v) { }
  34. 	std::string toString() const override { return name + ":s[\"" + value + "\"]"; }
  35. };
  36.  
  37. struct Config
  38. {
  39. 	template<typename... Ts>
  40. 	Config(const Ts&... args)
  41. 	{
  42. 		const ConfigPair* arr[] = {&args...};
  43. 		// use args as needed...
  44. 		for (const ConfigPair* arg : arr) {
  45. 			std::cout << arg->toString() << std::endl;
  46. 		}
  47. 	}
  48. };
  49.  
  50. int main()
  51. {
  52. 	Config c2(
  53. 		ConfigPairInt("one", 1),
  54.         ConfigPairDouble("two", 2.0),
  55.         ConfigPairString("three", "3")
  56. 	);
  57. 	return 0;
  58. }
Success #stdin #stdout 0s 4376KB
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stdin
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Standard input is empty
stdout
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one:i[1]
two:d[2.000000]
three:s["3"]
https://ideone.com/dPgOap
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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