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  1. #include <functional>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. enum System { SYS_A, SYS_B, SYS_C };
  6.  
  7. class Command {
  8. public:
  9.   typedef std::function<void()> FuncType;
  10.  
  11.   Command(FuncType func, std::initializer_list<System> requirements)
  12.   :func_(func), requirements_(requirements) { }
  13.  
  14.   void operator()() {
  15.     std::cout << "Executing Command:" << std::endl;
  16.     for ( System s : requirements_ )
  17.       std::cout << "   REQUIRES " << static_cast<int>(s) << std::endl;
  18.     func_();
  19.   }
  20.  
  21. private:
  22.   FuncType            func_;
  23.   std::vector<System> requirements_;
  24. };
  25.  
  26. class Scheduler {
  27. public:
  28.   void add(Command c) {
  29.     c();
  30.   }
  31. };
  32.  
  33. class Robot {
  34. public:
  35.   Robot()
  36.   :do_something_    (std::bind(&Robot::do_something, this),     {SYS_A, SYS_B}),
  37.    do_another_thing_(std::bind(&Robot::do_another_thing, this), {SYS_A, SYS_C}) { }
  38.  
  39.   void runRobot() {
  40.     s_.add(do_something_);
  41.     s_.add(do_another_thing_);
  42.   }
  43.  
  44. private:
  45.   void do_first_thing()  { std::cout << "   FIRST THING!" << std::endl;  }
  46.   void do_second_thing() { std::cout << "   SECOND THING!" << std::endl; }
  47.   void do_third_thing()  { std::cout << "   THIRD THING!" << std::endl;  }
  48.  
  49.   void do_something()     { do_first_thing(); do_second_thing(); }
  50.   void do_another_thing() { do_first_thing(); do_third_thing();  }
  51.  
  52.   Command   do_something_;
  53.   Command   do_another_thing_;
  54.   Scheduler s_;
  55. };
  56.  
  57. int main(int, char**) {
  58.   Robot().runRobot();
  59. }
Success #stdin #stdout 0s 2988KB
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stdin
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Standard input is empty
stdout
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Executing Command:
   REQUIRES 0
   REQUIRES 1
   FIRST THING!
   SECOND THING!
Executing Command:
   REQUIRES 0
   REQUIRES 2
   FIRST THING!
   THIRD THING!
https://ideone.com/tdq0aM
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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