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  1. #include <string>
  2. #include <iostream>
  3. #include <map>
  4. #include <stdexcept>
  5.  
  6. template<typename T>
  7. class Class1
  8. {
  9.     typedef double(T::*memFunc)();
  10.     std::map<std::string, memFunc> funcMap;
  11.  public:
  12.     void addFunc(std::string funcName, memFunc function)
  13.     {
  14.         funcMap.insert(std::pair<std::string, memFunc>(funcName, function));
  15.     }
  16.     double callFunc(const std::string& name, T& obj) const
  17.     {
  18.         typename std::map<std::string, memFunc>::const_iterator i = funcMap.find(name);
  19.         if(i!=funcMap.end())
  20.             return (obj.*(i->second))();
  21.         else
  22.             throw std::runtime_error("unknown function " + name);
  23.     }
  24. };
  25.  
  26. class MyClass
  27. {
  28.  public:
  29.     MyClass()
  30.     {
  31.         class1.addFunc("new function", &MyClass::getValue);
  32.     }
  33.     double getValue()
  34.     {
  35.         return 3.14;
  36.     }
  37.     void callit()
  38.     {
  39.         std::cout << "called and got " << class1.callFunc("new function", *this) << '\n';
  40.     }
  41. private:
  42.     Class1<MyClass> class1;
  43. };
  44. int main()
  45. {
  46.      MyClass mc;
  47.      mc.callit();
  48. }
Success #stdin #stdout 0s 2860KB
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Standard input is empty
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called and got 3.14
https://ideone.com/YAHSG
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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