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  1. #include <string>
  2. #include <map>
  3. #include <memory>
  4. #include <vector>
  5. #include <iostream>
  6.  
  7. struct Parameter
  8. {
  9. };
  10.  
  11. template<typename T>
  12. struct TypedParameter : public Parameter
  13. {
  14.     TypedParameter (const T& data): data(data){};
  15.     T data;
  16. };
  17.  
  18. struct ParameterList
  19. {
  20.     template <class... NamedParams>
  21.     ParameterList(NamedParams... namedParams)
  22.     {
  23.         buildList(namedParams...);
  24.     }
  25.  
  26.     std::map<std::wstring, std::shared_ptr<Parameter>> list;
  27.  
  28.     template<class T> void addParameter(const std::wstring& name, const T& param)
  29.     {
  30.         list[name] = std::shared_ptr<Parameter>(new TypedParameter<T>(param));
  31.     }
  32.  
  33.     template<class T> T& getParameter(const std::wstring& name) const
  34.     {
  35.         return static_cast<TypedParameter<T>*>(list.at(name).get())->data;
  36.     }
  37. private:
  38.     template <class... NamedParams>
  39.     void buildList() {}
  40.     template <class Name, class Value, class... NamedParams>
  41.     void buildList(Name&& name, Value&& value, NamedParams... restParams)
  42.     {
  43.         addParameter(name, value);
  44.         buildList(restParams...);
  45.     }
  46.     template<class Single, class... Rest>
  47.     void buildList(const Single&, Rest... rest);
  48. };
  49.  
  50. class Test
  51. {
  52. private:
  53.     const ParameterList _param;
  54. protected:
  55. public:
  56.     Test(ParameterList p):
  57.         _param(p)
  58.     {
  59.     }
  60.  
  61.     Test(const std::wstring& name, int age) : _param(L"name", name, L"age", age)
  62.     {
  63.     }
  64.  
  65.     void Present()
  66.     {
  67.         std::wcout << L"My name is " << _param.getParameter<std::wstring>(L"name");
  68.         std::wcout << L" and I'm " << _param.getParameter<int>(L"age") << L" years old." << std::endl;
  69.     }
  70. };
  71.  
  72. int main() {
  73.     Test test(L"Piotr", 42);
  74.     test.Present();
  75. }
Success #stdin #stdout 0s 3040KB
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stdin
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Standard input is empty
stdout
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My name is Piotr and I'm 42 years old.
https://ideone.com/J7SR6o
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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