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  1. #include <stdio.h>
  2. #include <map>
  3. #include <string>
  4.  
  5. class Base{
  6. public:
  7.   virtual void sayName()=0;
  8. };
  9.  
  10. typedef std::map<std::string,Base* (*)(const char*)> CtorsMap;
  11. CtorsMap cmap;
  12.  
  13. template <class T>
  14. class CtorRegistrator{
  15. public:
  16.   CtorRegistrator(const char* className)
  17.   {
  18.     cmap[className]=ctorWrap;
  19.   }
  20.   static Base* ctorWrap(const char* argName)
  21.   {
  22.     return new T(argName);
  23.   }
  24. };
  25.  
  26. class Child1:public Base{
  27. public:
  28.   Child1(const char* argName):name(argName){}
  29.   void sayName()
  30.   {
  31.     printf("My name is %s\n",name.c_str());
  32.   }
  33. protected:
  34.   std::string name;
  35.   static CtorRegistrator<Child1> ctorReg;
  36. };
  37.  
  38. CtorRegistrator<Child1> Child1::ctorReg("Child1");
  39.  
  40. class Child2:public Base{
  41. public:
  42.   Child2(const char* argName):name(argName){}
  43.   void sayName()
  44.   {
  45.     printf("mY nAME iS %s\n",name.c_str());
  46.   }
  47. protected:
  48.   std::string name;
  49.   static CtorRegistrator<Child2> ctorReg;
  50. };
  51.  
  52. CtorRegistrator<Child2> Child2::ctorReg("Child2");
  53.  
  54. const char* saveFile[4][2]={
  55.   {"Child1","one"},
  56.   {"Child2","two"},
  57.   {"Child1","eins"},
  58.   {"Child2","zwei"}
  59. };
  60.  
  61. int main()
  62. {
  63.   for(int i=0;i<4;++i)
  64.   {
  65.     cmap[saveFile[i][0]](saveFile[i][1])->sayName();
  66.   }
  67. }
  68.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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Standard input is empty
stdout
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My name is one
mY nAME iS two
My name is eins
mY nAME iS zwei
https://ideone.com/nTwrhP
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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