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  1. #include <iostream>
  2. #include <type_traits>
  3. #include <typeinfo>
  4.  
  5. using namespace std;
  6.  
  7. template<typename ParserTraits>
  8. struct ModuleA {
  9.  
  10.  
  11.     using ParserType = typename ParserTraits::ParserType;
  12.     using DType = typename ParserTraits::DType;
  13.     using OptionsType = int;
  14.  
  15.     using ModuleBType = typename ParserTraits::ModuleBType;
  16.     using ModuleBOptions = typename ModuleBType::OptionsType;
  17.  
  18.     void foo(){
  19.         std::cout << "ModuleA::foo: ParserType: " << typeid(ParserType).name() << std::endl;
  20.         std::cout << "ModuleA::foo: ModuleBType: " << typeid(ModuleBType).name() << std::endl;
  21.         std::cout << "ModuleA::foo: ModuleBOptions: " << typeid(ModuleBOptions).name() << std::endl;
  22.     }
  23. };
  24.  
  25. template<typename ParserTraits>
  26. struct ModuleB {
  27.     using ParserType = typename ParserTraits::ParserType;
  28.     using DType = typename ParserTraits::DType;
  29.     using OptionsType = float;
  30.  
  31.     using ModuleAType = typename ParserTraits::ModuleAType;
  32.     using ModuleAOptions = typename ModuleAType::OptionsType; //uncomment this!!
  33.  
  34.     void foo(){
  35.         std::cout << "ModuleB::foo: ParserType: " << typeid(ParserType).name() << std::endl;
  36.         std::cout << "ModuleB::foo: ModuleAType: " << typeid(ModuleAType).name() << std::endl;
  37.         std::cout << "ModuleB::foo: ModuleAOptions: " << typeid(ModuleAOptions).name() << std::endl;
  38.     }
  39. };
  40.  
  41. // The PARSER TYPE TRAITS Struct!!
  42. template<typename Parser,typename D>
  43. struct ParserTraits {
  44.     using DType = D;
  45.     using ParserType = Parser;
  46.  
  47.     using ModuleAType = ModuleA<ParserTraits>;
  48.     using ModuleBType = ModuleB<ParserTraits>;
  49. };
  50.  
  51. template<typename D, typename Derived = void >
  52. struct Parser {
  53.  
  54.     using DType = D;
  55.  
  56.     // Inject the derived class as the parser class for the modules
  57.     using DerivedType = typename std::conditional< std::is_same<Derived,void>::value, Parser, Derived>::type;
  58.     using ParserTraitsType = ParserTraits<DerivedType,DType>;
  59.  
  60.     using ModuleAType = ModuleA<ParserTraitsType>;
  61.     using ModuleBType = ModuleB<ParserTraitsType>;
  62.  
  63.     using ModuleAOptions = typename ModuleAType::OptionsType; //uncomment this!!
  64.     using ModuleBOptions = typename ModuleBType::OptionsType; //uncomment this!!
  65.  
  66.     virtual void foo(){
  67.         std::cout << "Parser::foo" << std::endl;
  68.         ModuleAType a;
  69.         a.foo();
  70.         ModuleBType b;
  71.         b.foo();
  72.     }
  73. };
  74.  
  75. template<typename D>
  76. struct ParserGUI: Parser<D, ParserGUI<D> > {
  77.  
  78.     using Base = Parser<D, ParserGUI<D> >;
  79.  
  80.     void foo(){
  81.         std::cout << "ParserGUI::foo" << std::endl;
  82.         typename Base::ModuleAType a;
  83.         a.foo();
  84.         typename Base::ModuleBType b;
  85.         b.foo();
  86.     }
  87.  
  88. };
  89.  
  90. int test() {
  91.     std::cout << "SceneParser1" << std::endl;
  92.     Parser<double> t;
  93.     t.foo();
  94.  
  95.     ParserGUI<double> d;
  96.     d.foo();
  97.  
  98.     ParserGUI<double> r;
  99.     ParserGUI<double>::Base & base =  r;
  100.     base.foo();
  101. }
  102.  
  103.  
  104. int main(){
  105. 	test();
  106. }
  107.  
Success #stdin #stdout 0s 3304KB
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stdin
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Standard input is empty
stdout
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SceneParser1
Parser::foo
ModuleA::foo: ParserType: 6ParserIdvE
ModuleA::foo: ModuleBType: 7ModuleBI12ParserTraitsI6ParserIdvEdEE
ModuleA::foo: ModuleBOptions: f
ModuleB::foo: ParserType: 6ParserIdvE
ModuleB::foo: ModuleAType: 7ModuleAI12ParserTraitsI6ParserIdvEdEE
ModuleB::foo: ModuleAOptions: i
ParserGUI::foo
ModuleA::foo: ParserType: 9ParserGUIIdE
ModuleA::foo: ModuleBType: 7ModuleBI12ParserTraitsI9ParserGUIIdEdEE
ModuleA::foo: ModuleBOptions: f
ModuleB::foo: ParserType: 9ParserGUIIdE
ModuleB::foo: ModuleAType: 7ModuleAI12ParserTraitsI9ParserGUIIdEdEE
ModuleB::foo: ModuleAOptions: i
ParserGUI::foo
ModuleA::foo: ParserType: 9ParserGUIIdE
ModuleA::foo: ModuleBType: 7ModuleBI12ParserTraitsI9ParserGUIIdEdEE
ModuleA::foo: ModuleBOptions: f
ModuleB::foo: ParserType: 9ParserGUIIdE
ModuleB::foo: ModuleAType: 7ModuleAI12ParserTraitsI9ParserGUIIdEdEE
ModuleB::foo: ModuleAOptions: i
https://ideone.com/nVWfp6
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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