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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. struct lua_State {};
  5. template <class T>
  6. class Data
  7. {
  8. public:
  9. 	static T& storedValueFromLuaStack(lua_State* state, int index)
  10. 	{
  11. 		static T a{};
  12. 		return a;
  13. 	}
  14. 	static Data<T> fromLuaStack(lua_State* state, int index)
  15. 	{
  16. 		return Data<T>{};
  17. 	}
  18. };
  19.  
  20. template <class U>
  21. class interpretValueReturnType
  22. {
  23. public:
  24. 	interpretValueReturnType(lua_State *state, int index) : state(state), index(index) {}
  25.  
  26. 	operator U& () &&
  27. 	{
  28. 		return Data<U>::storedValueFromLuaStack(state, index);
  29. 	}
  30.  
  31. 	operator Data<U> () &&
  32. 	{
  33. 		return Data<U>::fromLuaStack(state, index);
  34. 	}
  35. private:
  36. 	lua_State *state;
  37. 	int index;
  38. };
  39.  
  40. template <class U>
  41. interpretValueReturnType<U> interpretValue(lua_State *state, int index)
  42. {
  43. 	return interpretValueReturnType<U>(state, index);
  44. }
  45.  
  46. int main() {
  47. 	lua_State *state;
  48. 	int& a = interpretValue<int>(state, 1);
  49. 	Data<int> b = interpretValue<int>(state, 1);
  50.  
  51. 	auto c = interpretValue<float>(state, 1);
  52. 	float& d = std::move(c);
  53. }
Success #stdin #stdout 0s 3408KB
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https://ideone.com/xqEVeT
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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