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  1. #include <iostream>
  2. #include <string>
  3. #include <memory>
  4. #include <vector>
  5. #include <type_traits>
  6.  
  7. struct IFactory {
  8.   typedef std::shared_ptr<IFactory> SharedFactory;
  9.   virtual std::string Name() {
  10.     return "IFactory";
  11.   }
  12.   template<class... Arg>
  13.   SharedFactory Dup(const Arg&... A) {
  14.     return std::make_shared<std::remove_reference<decltype(*this)>::type>(A...);
  15.   }
  16.   enum {
  17.     ClassIFactory, ClassA, ClassB,
  18.   };
  19.   bool Say() {
  20.     std::cout << "Hoge" << X << std::endl;
  21.     return true;
  22.   }
  23.   int X = 123;
  24.   IFactory() {
  25.     std::cout << "IFactory() called. X=" << X << std::endl;
  26.   }
  27. };
  28.  
  29. class A : public IFactory {
  30. public:
  31.   std::string Name() {
  32.     return "A";
  33.   }
  34.   bool Say() {
  35.     std::cout << "Baw" << X << std::endl;
  36.     return true;
  37.   }
  38.   int X = 0;
  39.   A() {
  40.     std::cout << "A() called. X=" << X << std::endl;
  41.   }
  42. };
  43.  
  44. class B : public IFactory {
  45. public:
  46.   std::string Name() {
  47.     return "B";
  48.   }
  49.   bool Say() {
  50.     std::cout << "Maw" << X << std::endl;
  51.     return true;
  52.   }
  53.   char X = 0;
  54.   B() {
  55.     std::cout << "B() called. X=" << X << std::endl;
  56.   }
  57. };
  58.  
  59. typedef std::vector<IFactory::SharedFactory> FType;
  60.  
  61. FType MakeVector() {
  62.   FType F = { std::make_shared<IFactory>(), std::make_shared<A>(), std::make_shared<B>() };
  63.  
  64.   return F;
  65. }
  66.  
  67. int main()
  68. {
  69.   FType F = MakeVector();
  70.  
  71.   auto X = F[IFactory::ClassIFactory]->Dup();
  72.  
  73.   std::cout << X->Name() << std::endl;
  74.   std::cout << X->Say() << std::endl;
  75.  
  76.   A* AA = static_cast<A*>(&(*X));
  77.  
  78.   std::cout << AA->Name() << std::endl;
  79.   std::cout << AA->Say() << std::endl;
  80. }
  81.  
Success #stdin #stdout 0s 4560KB
comments (?)
stdin
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Standard input is empty
stdout
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IFactory() called. X=123
IFactory() called. X=123
A() called. X=0
IFactory() called. X=123
B() called. X=
IFactory() called. X=123
IFactory
Hoge123
1
IFactory
Baw0
1
https://ideone.com/s9beHs
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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