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  1. #include <iostream>
  2. #include <vector>
  3. #include <functional>
  4.  
  5. class Base {
  6.     std::string data;
  7. protected:    
  8.     std::vector< std::function<void()> > steps;
  9. public:
  10.     Base() : data("qq")
  11.     , steps{
  12.         [](){ std::cout << "BaseMethod1()" << std::endl; }
  13.         , [](){ std::cout << "BaseMethod2()" << std::endl; }
  14.         , [](){ std::cout << "BaseMethod3()" << std::endl; }
  15.         , [this](){ std::cout << "data: " << data << std::endl; }
  16.     }
  17.     { }
  18. };
  19.  
  20. struct A final : Base {
  21.     A() {
  22.         steps.insert(
  23.             steps.begin() + 2,
  24.             [](){ std::cout << "A_Specific_Operations()" << std::endl; }
  25.         );
  26.     }
  27.  
  28.     void doSomething() {
  29.         for( auto&& step : steps ) step();
  30.     }
  31. };
  32.  
  33. struct B final : Base {
  34.     B() {
  35.         steps.insert(
  36.             steps.begin() + 1,
  37.             [](){ std::cout << "B_Specific_Operations()" << std::endl; }
  38.         );
  39.     }
  40.  
  41.     void doSomething() {
  42.         for( auto&& step : steps ) step();
  43.     }
  44. };
  45.  
  46.  
  47. int main() {
  48.  
  49.     using namespace std;
  50.  
  51.     A().doSomething();
  52.     cout << endl;
  53.     B().doSomething();
  54.  
  55. }
Success #stdin #stdout 0s 2992KB
comments (?)
stdin 
Standard input is empty
stdout 
BaseMethod1()
BaseMethod2()
A_Specific_Operations()
BaseMethod3()
data: qq

BaseMethod1()
B_Specific_Operations()
BaseMethod2()
BaseMethod3()
data: qq
https://ideone.com/C01TCT
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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